Showing posts with label ceramics. Show all posts
Showing posts with label ceramics. Show all posts

Friday, 13 December 2013

'Very Good'

‘Very Good’ Lecture – Norwegian Crafts, National Museum for Decorative Art and Design, Oslo. 21 November 2013

(This is part of the lecture that I gave recently in Oslo on the subject of the relevance of craftsmanship)

I have been reading a book by Robert MacFarlane (2012) called The Old Ways. In it he describes exploring ancient routes, on foot and by sailing ship. He talks about the way in which the creators and followers of these paths and roads have left their traces on the landscape and how present-day wanderers connect to past generations through those marks and signs, whilst adding their own for future generations.

MacFarlane defines the ancient Celtic word immram as a kind of sea-voyage from the known to the unknown. It can be used to describe a pragmatic journey, one from A to B, but also a mystical spirit-voyage, something like the Aboriginal walkabout. Through this journey the present can be reunited with the past and the real can be connected to the unreal. 
Whilst reading the book, I was thinking about how this could also describe the act of making. There are similarities. For one thing, making is not a static activity; it requires movement, often repeated movement, like walking. For the most part, the paths that the maker treads are familiar; we know our tools and the way to use them. But from time to time the conditions change. This is analogous to how a skipper of a sailing ship must constantly be alert to subtle signs that the wind direction is going to change. The tools and processes that makers use also need to be responsive and evolve. Traditionally, the knowledge and skills are passed on from hand to hand. Once they travelled the world along trade routes such as the Silk Road, and now they can be passed on over the Internet via YouTube. 

A few years ago I held some fourteenth-century pots excavated at the farm next door to where I live. When I put my fingers on the marks left by the potters’ hands, I felt an almost tangible electric current arcing back over 600 years and uniting us. It raised the hairs on the back of my neck.

Making is a voyage of discovery, one where we adapt our knowledge and experience to unfamiliar or unknown landscapes. For me, it is a way of visualising the abstract, of realising an idea or concept as an artwork. Recently, Grayson Perry described an artist ‘as a pilgrim on the road to meaning’.[1]

I would like talk about my practice as a way to explore how the methods I use have contributed to the blurring of boundaries between art, craft and design. I hope that this way of working will encourage the viewer to ask ‘what and why’ not ‘how’. Having said that, in making my artworks, I am very interested in the ‘how’, as I am using emerging technologies that were not designed to do what I try to make them do. But I hope the viewer will go beyond that stage and start to unpack the narrative and react to the ideas that the works explore.

We are now in the early stages of a new Industrial Revolution; over the past 20 years digital technology has made massive changes to the way things are designed and made. According to Grayson Perry, if Michelangelo was here now, he would be making CGI movies. And can you imagine what Da Vinci would be doing?[2] Designers and makers have always been interested in materials and processes, for without them it is impossible to realise an idea as an object.

Technological advances often create new movements in art and design. For instance, the American portrait artist John Rand invented the paint tube in 1841. Before that, all oil paint had to be prepared by an artist or assistant in just the small quantities needed for the day. You could therefore say that French Impressionism would not have happened without Rand, as the paint tube allowed artists to paint outdoors. But when we visit the museums in Paris to see Monet’s paintings of water lilies, do we think of John Rand?

Something similar is happening now with emerging digital technologies; there is a growing community of creative people appropriating these new tools and adapting them to purposes for which they were never intended. And as a result, there are questions being asked about the place of these new tools in the practice of makers.

My particular interest is in making meaningful objects that explore both the actual world and the virtual world of computers. To achieve this I use some of the new tools that are available to us, particularly Additive Manufacturing, which refers to the technology commonly known as 3D printing.

For me, the attraction is that this technology allows previously impossible objects to be made.

Many people, and this includes many of my colleagues from the studio pottery world, think that 3D printing simply happens by ‘pressing the button’, but through my works I hope to demonstrate that the new tools I use require the acquisition of new craft skills and thought processes.

Yet being seduced by this wonderful new toolbox is unlikely to produce great art or craft. I agree with Peter Lunenfeld when he writes that technological enchantment leads down a slippery slope to the ‘media of attractions’, defined as ‘[a]rtefacts of digital culture whose appeal is essentially their perceived novelty. They attract less for what they mean than for the fact that they are’ (Lunenfeld 2001: 173).

Working in the virtual world of the computer does not teach you about materials and processes. It should be underpinned by working with your hands, testing materials and exploring processes. In other words, it is a matter of learning by doing. Getting involved in making things at an early age and staying involved must surely be the way forward in order to reach a level where tacit knowledge and haptic skills can be applied almost subconsciously to the creation of a meaningful object.

I might not go so far as to say that we need a new Arts and Crafts movement, but if we do, I would like it to have a less romantic vision and a more inclusive philosophy than that of William Morris. I would want it to embrace the new technology and recognise the craft of working with code. I believe C.R. Ashbee, who was an important proponent of the Arts and Crafts movement, would have agreed with me for the most part, as he quotes his friend Frank Lloyd Wright in his journal:

“My God” he said, “is Machinery; and the art of the future will be the expression of the individual artist through the thousand powers of the machine, - the machine doing all those things that the individual workman cannot do. The creative artist is the man who controls all this and understands it.” (Wright, quoted in Hanks 1979: 79)

With this I am not saying that I have all the answers, but I would like to describe the journey that I have made as one possible route to creatively combining the old and the new skills and tools. I define myself as a Maker, someone happy to explore the overlapping grey area between art, design and craft.

Over the years I developed the traditional skills of a potter. For the past few years I have been learning to transfer these skills to some new tools, hoping to realise their creative potential. However, for over 20 years my wife and I ran a pottery studio where we designed, made and supplied masses of functional domestic ware to shops, galleries and stores such as Habitat in the UK and Barneys in the US and Japan. The work we produced was decorative and functional. So over time I developed the craft skills and tacit knowledge required to produce lively pots.

These pots are very much about the materials and processes that I used to make them. I was trying to freeze a moment in time, capture a curve with grace and energy and record the effects of flame interacting with rich lead glazes. However, in the 1990s, the work began to move away from the purely functional. I started creating pieces that investigated the abstract nature of forms, using surface treatment to create harmony or disharmony and to create illusion and uncertainty for the viewer.

Alongside my love of ceramics I had been developing an interest in digital technology. When websites came about, I thought it would be useful to have one. I wanted to design the website myself so I went to an evening class and learned to write HTML code. I discovered that it involved a different way of thinking, a different way of problem solving than what I was used to as a ceramicist. And I had also heard of something then called Rapid Prototyping, which referred to digital techniques for creating 3D prototypes. So I thought ‘Fantastic, I can make anything!’ But how could I bring these two worlds together?

In 2006 I was fortunate to be accepted by the Royal College of Art to undertake an MPhil research project. I needed a break from running the pottery business in order to develop the ideas that had been bubbling away for a number of years.

At this stage I started using CAD software and found it to be a very useful tool for exploring variations of a form. It makes it easy to develop numerous iterations of an idea, and, even though the virtual is no replacement for the actual, there is enough visual information to determine whether the geometry and proportions are going to work in reality.

Once I was happy with a design on screen, I could translate the virtual into the actual using traditional pottery methods. Through this investigation, I could explore the relationship between the traditional craft skills that I had amassed over the previous 20 years and the new digital tools that I had become interested in. In an early RCA project I tried to create a Torus form using traditional techniques, but I could not achieve the exact shape, scale and control over the proportions that I was looking for. So I began exploring a number of iterations of the form using Rhino CAD software, returning to the wheel at each stage to throw what I had virtually created on the computer. Once satisfied with the form of the piece, I then had a full-scale model produced by CNC milling, which shapes the object with high precision. From the resulting prototype, I cast a mould and then slip-casted the object from that. The final outcome of the project is called The Event Horizon, and I still hope it engages viewers in a sensory experience, rather than encouraging them to focus on how the work is made.

After this exploration of how traditional and digital tools can be creatively brought together, I came to the conclusion that they are only tools and that there has to be a reason for using them, whether it be a desire to explore, an idea to communicate or a problem to solve.

My final practical research project at the Royal College of Art was the first fully digital piece that I made. I believe it gives insight into the thinking and the craft that went into its production.

The project was intended to test the digital software and hardware, but I also wanted to tell a story with the work. I decided to redesign an iconic object from the first Industrial Revolution. Inspired by Josiah Wedgwood, the great ceramic innovator of the eighteenth century, I chose a tureen from the 1817 catalogue. I recreated it on Rhino software and gave it a delicately pierced surface inspired by bone and the natural objects used by Wedgwood and his contemporaries as sources of inspiration for many of their designs. The pierced surface also refers to the artificial bone produced by Additive Manufacturing for medical reconstructive surgery.

The tureen was printed on a ZCorp 3D printing machine in a type of plaster material. It was then infiltrated to give the plaster material more strength and then coated in a proprietary non-fired ceramic material, formulated to closely resemble Wedgwood Black Basalt.. For some versions I used traditional Wedgewood colours, like the pale blue we know from Jasperware pieces, and sometimes I used very strong modern colours.

The next project I did was based on a 1766 Sèvres porcelain jar with a lid, which I found on display in the Wallace Collection in London. Through this piece, I wanted to explore the cultural and financial value of objects. Its theme is pretence, but it also explores making and the importance of skills. I wanted to compare the materials and processes used in the manufacture of the two pieces. The original Sèvres piece is made of porcelain, a beautiful but non-precious material that has been skilfully fashioned by artisans. At the time when it was made, porcelain had been given enormous cultural and financial status, primarily through the patronage of the French Royal Court.

In contrast, my response is made of nylon, a useful but simple everyday material. The design took me about 150 hours to create on the computer. It was then printed using extremely expensive technology, coated in non-fired ceramic material and then carefully decorated with artificial gold leaf. It is now in a private collection in New York, appropriately displayed alongside an Andy Warhol painting. So how do we equate value and worth? And how does craft fit into the calculation? These are questions I try to address through my work.

Today there is an ever-expanding array of new high-tech tools at our disposal. They are all worthy of exploration, but I do not want to use them just because they are glitzy and new. They must enable me to convert an idea into a meaningful object. And I hope that my practice plays a part in demonstrating that the making of thoughtful objects – whether they are categorised as art, craft, design or some hybrid – is a process and must be responsive in order to make those disciplines relevant to the times in which we live.



Hanks, David A. (1979) The Decorative Designs of Frank Lloyd Wright, Mineola, NY: Courier Dover Publications.

Lunenfeld, Peter. (2001), Snap to Grid: A User’s Guide to Digital Arts, Media, and Cultures, 1st ed., Cambridge, MA: MIT Press.

MacFarlane, Robert (2013) The Old Ways, London: Penguin.


[1] Reith Lecture, 2013. BBC Radio 4, 05 November 2013.
[2] Ibid.

Wednesday, 28 August 2013

Joining the Crafts Council

27.08.13


Today was spent at the Crafts Council in London, being inducted into my new role of Maker Trustee. I spent the day in meetings with various CC folk, learning how the organization operates and being introduced to the main issues that are currently under discussion.

My relationship with the CC goes back to 1985 or 86, when Vicky and I needed to find a new market for our pots and Northern Arts provided CC sponsorship to attend the Chelsea Crafts Fair. It was the last year that it was run by Lady Phillipa Powell, before the Crafts Council took over the show. It was a great success and exactly the type of support that we required at the time. 
In the 1990’s we received 2 travel grants from Northern Arts; the first took us on an extended tour of Hungary to look at traditional slipware. The trip resulted in our work developing in a new, unexpected direction and the writing of a book on contemporary slipware, the research for which was assisted by our second travel grant from Northern Arts. As you will have gathered, the support we had was well-targeted and brought about significant changes to our practice, revitalizing it and ensuring its longevity.
After the Labour goverment came to power in 1997, the Arts Council subsumed the Crafts Council, and my perception was that the organization had lost its autonomy, its efficacy had been diluted and its very existence was uncertain. The move out to Islington (hardly remote!) and the closure of the gallery and the shop at the V&A seemed to support my doubts and the Crafts Council slowly faded from my consciousness. 
However, the past few years have seen resurgence, both in CC activity and interest in craft. Take the ‘Powerof Making’ exhibition, co-curated by the CC and V&A. It attracted 340,000 people; one of the most popular shows ever held at the V&A. There was everything from dry-stone walling to 3D printing and a plethora of exquisite objects that I really wanted to get my hands on. 
For me, the exhibition demonstrated the common language of all makers and how a thatcher in Somerset is engaged in the same thought processes as I am with all my high-tech gear. We share the same approach to materials, processes and techniques and take pride in our ability to use creative thinking to produce meaningful work. The exhibition also demonstrated that ‘making’ is innate; it’s something that is hard-wired in our DNA and has enduring appeal.
So it’s a great time to be involved with the Crafts Council and as a Maker Trustee I am very keen to pass on your thoughts to the board. I am interested to hear about your perception of the CC, whether you feel it represents you as a maker and the type of activities you would like it to be engaged in.

The Future is Here?


The September/ October issue of Crafts Magazine (244) has 2 articles that question the place of 3D printing within the Crafts world. Edwin Heathcote is seriously underwhelmed by the Design Museum’s The Future is Here: A New IndustrialRevolution. He emphasizes what I presume he thinks of as an abuse of the technology in the range of ’ugly, over-engineered and under-thought objects, desperate to convince us that here is a technology that will change the world.’ Though I haven’t seen the exhibition, I suspect that the choice of exhibits is at fault, as I do believe we have a new way of making things that will allow advances in design and manufacturing. I wonder if the exhibition includes examples of 3D printed bio-compatible materials that allow reconstruction of body parts such as the trachea for patients recovering from cancer surgery, or relatively simple objects such as optimized Airbus door hinges that reduce fuel consumption by $1000 a year?
Geoffrey Mann thinks there’s ‘danger in going digital’. Both Heathcote and Mann question the digital aesthetic and the constraints of materials available to 3D printers, but as Mann points out, ‘We’re only at the beginning, surely the best is yet to come’.
I for one would certainly go along with that.

Which brings me to the direction of my own work. For some time I have had the same concerns, and though I have tried to use the technology to make work that doesn’t shout ‘3D printed’ at first sight, it still feels as though it can go further in being integrated with my previous practice. That, after all has been my aim all along. So how do I bring the material qualities, cultural associations and aesthetics of slipware (and other ceramic types) into the world of digital design and Additive Manufacturing? First of all, I must be careful not to lose the creative potential of AM, so the choices are:
·       Print in clay
·       Print moulds for slipcasting
·       Apply an alternative surface finish, one with other cultural associations.

The themes of my most recent work have moved on from simply making ‘impossible’ objects, based on historical ceramics to exploring how we increasingly engage with the physical world through the 2 dimensions of a screen. And no matter how high the resolution, the experience can only ever be a fraction of the real thing.

3D Printing in clay is still in its infancy. And though I’m sure it will be refined, it is not going to solve my immediate needs. Jonathan Keep, however appears to have produced a reliable ‘Computer Controlled Coiler’, (a development of the Bits from Bytes RapMan 3D printer,) that looks as though it could quite easily be scaled up to produce larger objects. I need to find out more and will be contacting him this week to discuss acquiring one, either for MIRIAD or for my personal use.

Printing moulds on a ZCorp printer is feasible, however, slipcasting relies on the cast being able to be removed from the mould, therefore it would not be possible to produce objects as complex as the ones that I have so far produced by SLS. My experiment to print pate de verre from a ZCorp mould was successful, but as the mould was destroyed in the process, only one object could be produced. However, that isn’t necessarily a problem.
The Matrix 300 paper printer at MIRIAD holds possibilities for producing models from which moulds can be taken. There are limitations, particularly the printing of finely detailed objects as small pieces of paper are prone to clog up the workings, bringing the machine to a grinding, ugly halt!

Applying an alternative surface finish could be a temporary way forward, but the connection to my previous ceramic practice would be broken. So I’m not keen on that route at the present time.

More thoughts to follow…

Thursday, 20 June 2013

Ceramic 3D printing tests 07 - some results

Well, it's my last day here at KHIO, for now. I will be returning in Novemeber to speak at the Norwegian Crafts Annual Meeting and hope to spend a few days here at KHIO to conduct some more tests. But by then I should have the ZCorp 406 running back in Manchester and have made some tests of my own.

I plan to continue the postings, and would appreciate any thoughts, reactions or assistance from like-minded explorers.


Results of the test bar firings: 









POWDER TYPE
RATIO *
LENGTH mm **
SHRINKAGE
950°C



Red Clay***
1:1:2
Turned to 'foam'

1:1:3
90
10%
1:1:4
91
9%
Potclays****
1:1:2
± 84
16%
1:1:3
86
14%
1:1:4
89
11%
1000°C
Red Clay
1:1:2
Turned to 'foam'

1:1:3
90
10%
1:1:4
91
9%
Potclays
1:1:2
± 84
16%
1:1:3
86
14%
1:1:4
88
12%
1050°C
Red Clay
1:1:2
Turned to 'foam'

1:1:3

These tests were dipped in vitreous slip, fired to 1000°C, then glazed and fired to 1085°C
1:1:4
Potclays
1:1:2
1:1:3
1:1:4
11000°C
Red Clay
1:1:2
Turned to 'foam'

1:1:3
88
12%
1:1:4
90
10%
Potclays
1:1:2
± 82
18%
1:1:3
83
17%
1:1:4
85
15%
1085°C GLAZE
Red Clay
1:1:2
N/A

1:1:3
89
11%
1:1:4
91
9%
Potclays
1:1:2
83
17%
1:1:3
85
15%
1:1:4
86
14%

* REFERS TO MIX OF SUGAR, MALTODEXTRIN AND CERAMIC POWDER, i.e 1:1:4 =1 part sugar, 1 part maltodextrin, 4 parts ceramic powder.

** Refers to the recessed 100mm line in the test bars measured after firing.

*** Pure red clay supplied by KHIO

**** Potclays ceramic powder mix, contains flux, supplied by Michael Eden (MIRIAD)


The Prtlnd Vase is still in the kiln, hopefully I will be able to unpack it before I leave here this evening... I'll let you know.
A second vase was printed yesterday and is still in the powder...

Wednesday, 19 June 2013

Ceramic 3D printing tests 06 - and more...

19.06.13

My penultimate day here at KHIO in Oslo and a morning of ups and downs. I mentioned yesterday that we were asked to use a kiln with extraction that has the benefit of being able to control the cooling cycle.

As you can see, the new test cubes, with thicker walls, have suffered in the firing. one has broken in two, one has cracked and the third is OK.









 

The larger version of my architectural piece has also suffered. It has deformed due to the weight of the upper part and the shell has come away from the core. There are a number of possible causes:
  1. The speed of firing was too fast.
  2. The speed of cooling was too fast.
  3. The structure of the piece was not strong enough.
  4. The binder settings were wrong. 
  5. The ceramic powder formulation.
My feeling is that the cause was primarily either 1 or 2. Previous firings have been successful and the deformation of the pieces has happened in the printer, not in the kiln. 
The structure could be stronger to support the upper part.

We obviously need to conduct more tests, especially as the red earthenware seems to behave itself very well.

I have just found out that the Potclays powder will withstand 1300°C, so I plan to take some of the tests back to Manchester with me and try a selection of high temperature glazes.



So far today, the good news has been my Prtlnd Vase. It appears to have come through the printing unscathed, I'm very pleased with the detail of the surface decoration. There's litle loss of definition. The photograph shows the piece just after it was cleaned up in the depowdering unit, but it is still full of powder at this point. At this moment in time it is sat in a warm kiln, my next job, when I have finished writing this, is to remove the powder from the interior and put it back into the kiln on a warming cycle. And then programme the kiln to start firing at about 10pm this evening.
If it goes well, I will be able to take it home with me to decorate and glaze fire.






Here's what the Prtlnd Vase looked like on the Zprint software.

Before packing up for the day I glazed a selection of tests with the clear glaze and set them to fire overnight.

Tomorrow afternoon's kiln opening will be very interesting, hopefully there will be some posiitve results.

Tuesday, 18 June 2013

Ceramic 3D printing tests 05 - Yet more...

18.06.13

Only 3 days left here in Oslo and suddenly I'm trying to work out how to fire more kilns than time allows! However, Knut who runs the ceramic workshop has asked me to use a larger kiln that has extraction. The sugars in the ceramic mix were filling the (huge) kiln room with caramelly smells (& smoke). The good thing about the larger kiln is that the cooling can be controlled and assisisted by fans, so I stand a chance to get the majority of the tests through.

Here's the results of the 1100°C firing. The only reason that the red clay bars are broken is that we (very non-scientifically) broke them to see how strong they are in the green, unfired state. The sugars actually make them fairly difficult to break, there was a certain amount of stretching, rather than a simple, clean snap. It gives you more confidence when removing pieces from the printer, though after 2 hours they are still flexible. We find that leaving them overnight is best.





Yesterday afternoon, Trine introduced me to some more tools in the modo software toolbox. I hoped to print a ceramic version of my Prtlnd Vase, an interpretation of the Portland Vase. I produced it in nylon by SLS and it was recently acquired through the Art Fund at Collect for the New Walk Gallery in Leicester.


The handles on the original CAD file are a little thin for ceramic printing and modo was a very useful for rebuilding them intuitively. The software also tidied up the mesh and considerably reduced the file size.
I was keen to build this as large as possible which meant converting all the Potclays powder to 1:1:4 which we think is the strongest of our trials. Trine had mixed some more yesterday, so that was sieved together with the rest and there was enough to completely fill the feed chamber. I had a conversation with Trond, who looks afetr the machines in D-Form. He suggested that the binder settings should be reduced as it could be the cause of the deformation in the build. He thinks they could simply be too wet. So I reduced the Shell to 85% and the Core to 70%. We will see if it has the desired effect.

After putting the build on, I mixed up a lovely lead-based clear earthenware glaze. The recipes that we have used for many years in the studio at home are Lead Sesquisilicate based, but they don't stock it at KHIO (who does?). The recipe I used is taken from 'The Potters Palette' by Christine Constant and Steve Ogden, an excellent source of some fabulous glaze recipes and shamefully out of print.

Lead Bisilicate 65
Whiting 10
Potash Felspar 15
China Clay 10

Fire to 1085°C with a 20 minute soak. A small amount of liquid calcium chloride added to the glaze prevents it from settling out and aids even glazing. But be cautious, if you add too much you can turn the glaze into the consistency of blancmange!


These pieces were popped into the kiln along with some vitreous slipped pieces. The plan for tomorrow is to slip and refire as much as possible and then glaze and fire them.

And then I'll hopefully have time to squeeze the Prtlnd Vase into a firing before my early morning flight back to the UK on Friday morning.

Monday, 17 June 2013

Ceramic 3D printing tests 04 - More

16.06.13

Sunday morning is quiet in Oslo, mind you as a capital city it has a very relaxed, unhurried feel any day of the week. Someone will tell me that I happen to crossing pleasant, residential parts of town, but my impression is that people are friendly and are lucky to enjoy a safe and engaged lifestyle. One major downside though, is the expense. So I'm cooking up big pots of veggie bolognese sauce for pasta.



Anyhow, I arrived at KHIO before 9.00 and went straight down to the kiln room to see the results of the 1000°C firing. 
I have never seen such well equipped facilities as these. The kiln room alone is on an industrial scale, the students must either feel really excited on seeing them or completely daunted, particularly as some ceramics students have never touched clay before starting their degree!

The red clay 1:1:2 mix has decomposed more than at 950°C, but the other test bars look pretty similar. 
The shrinkage is approximately 14%, which I think is acceptable. When the tests are  finished I'll analyse them more carefully and publish the findings so that comparisons can be made easily.








I started another build with a new, larger version of my architectural piece and a test cube with thicker walls. This time I filleted the edge of the circular openings, as the first version has edges that are sharp and brittle.











And here are the 1050°C tests, the photograph taken just after the 'african vegetable' has been picked up! It came out of the kiln in one piece, quite an achievement considering the sections were very thin. I don't understand why the piece at the bottom right of the photograph broke in the firing. I don't think it was a stress fracture. The Potclays 1:1:3 and 1:1:4 are stronger than at the lower temperatures and are slightly stronger than the red earthenware versions.







The test cubes fired with very little extra distortion. They have now been dipped into the vitreous slip and await firing.





 

Saturday, 15 June 2013

Ceramic 3D printing tests 03 - How?

15.06.13

Well, not exactly how, as I'm starting from the 'ground up' and there's a great deal to learn. 
But hopefully the collaboration between MIRIAD and KHIO will be the start of forming a larger community of 3D printing hackers and researchers willing to share experience and also to discuss the wider implications of 'digital making'.

The test bars fired to 950°C
KHIO is open at the weekends, so I was able to get in there first thing and unpack the first of our firings. As you can see, the results are 'interesting', the red clay 1:1:2 mixture has almost turned into a fired foam. There's obviously a lot of gas being given off, and not enough clay to bind the bar together. As there is flux (glaze material) in the Potclays powder, the 1:1:2 has held together much better. 
Both the 1:1:3 and 1:1:4 tests are similar, though I haven't tried to snap them yet. 
The next stage was to dip half of these tests in vitreous slip (recipe below) and fire them with the 1000°C test bars. I'll be able to unpack them tomorrow and see how they have fared.


Before leaving the Academy yesterday evening, we set up a new build with some more adventurous tests. And this is what they looked like this morning. Even though the pieces are completely supported by the excess material during the build, there is still a certain amount of distortion. They were printed in the Potclays 1:1:3 powder.







Trine's scan of an African vegetable looks excellent, but I didn't see the original, (or even view the stl file,) so I can't compare.











My cube tests are simply too thin, however I will fire them.













I must add that my architectural piece is designed to look warped! I have slightly re-designed this piece, altering the scale and wall thickness. I'm going to print them tomorrow and hope they are worthy of glazing.










Vitreous Slip Recipe:

These are UK ingredients, but I'm sure equivalents are obtainable in other parts of the world. I use it to make the 3D printed ceramic tests less porous and able to be glazed in the normal way. It is opaque and quite a bright white due to the high china clay content.

China Clay:  1kg
Ball Clay:     1kg
Potash Feldspar: 100gms
Zirconium Silicate (Disperzon): 100gms

It will fire to stoneware and possibly higher, though I personally haven't tried it at porcelain temperatures. It can be applied to plastic clay, though it's easier to apply to biscuit-fired ceramic. It can be stained with oxides and body stains.