For the 2010 Samhuinn Fire Festival in Edinburgh, I co-organised a group representing the role of the spirit of Summer, doomed to fall to the wolves of Winter, by means of a carnival troupe of mediaeval-style musicians, fantastical animals and basket-bearers distributing flowers and cake, glitter and bubbles. I led the puppeteers together with my friend Hannah Werdmuller, and Andy Glowaski organised the rest. (more…)
Sunday, October 30, 2011
Friday, March 14, 2008
I’ve been having great fun lately customising USB sticks1 using epoxy putty. The putty doesn’t require any baking, and it seems to be hard enough and strong enough to survive in pockets full of keys for long periods without any visible scratching – although it does accumulate smudge marks very quickly, they’re easy to wipe off.
It’s an interesting challenge to decorate a USB drive, because you start out with a sort of rectangle a few millimetres thick, and it’s probably best not to make the final product very much bigger than that, so that it doesn’t take up too much space in pockets and can still be plugged into computers which might not have much space around their USB sockets. That means you’re constrained to subjects which can be plausibly fitted into a long, thin cuboid with a minimum of protrusions. You also ideally want things with a head or some other part which can be unobtrusively removed, with a join just at the right distance from one end…
The basic technique is pretty straightforward – you just mix up the epoxy putty with the hardener, roll it into a sheet and cover the drive in it. Leave space for anything you don’t want to obscure, like the LEDs most pen drives have that light up to show when they’re active, or loops for keyrings. There are two approaches you can take at this stage. One way is to use a thin sheet and add more putty to that – freshly-mixed epoxy putty sticks extremely well to almost anything, but especially itself. The other way is to use more putty to begin with, and extrude or carve from that.
There are many different varieties of epoxy putty available. I’ve been using Sylmasta A+B (formerly SuperCarve), and so far I’m very happy indeed with the new reformulated version of this – the colours are pure and vivid, where before the blue and the yellow were both slightly greenish2. They’ve also extended the range to include brown and black, so it’s now possible to mix almost any colour from those available. For about £50 I got 250g of each of five colours, which should go a looong way. I have also had good results using metallic powders you can rub into the putty while it’s still soft. Most of the powder sticks well to the putty if it’s rubbed in well enough, but it’s worth varnishing these afterwards to be safe.
So far I’ve made three USB monkeys, a couple of aliens, a zombie badger that runs Linux and a fish that really didn’t work the way I wanted it to. I might make a crocodile next. Any other suggestions are welcome, whether or not you want to buy them yourself! As ever, I am very happy to take commissions…
Saturday, April 21, 2007
Inspired initially by this excellent figure of an Ood (out of Doctor Who) and its co-creators answers to my questions about it, and spurred on by this thread in Flickr’s Miniature Sculpting forum, I recently purchased some epoxy putty for modelling.
I first got enthused reading about Magic Sculp, but eventually established that even the cheapest UK supplier I could find, Sylmasta, charges around three times as much as it goes for in the US (and about twice as much as I pay for the same weight of polymer clay) – but as it happens, they also sell their own brand of epoxy modelling putties, Sylmasta A+B (white, or at least very light grey) and Super Carve (available in a range of colours), which also come highly recommended by random people off the internet. Milliput is the only epoxy putty I’d been exposed to in person before, and it’s very easy to get hold of – but it’s relatively expensive, and not very highly regarded by most of the sculptors I’ve seen expressing opinions.
Epoxy putty of any variety has several advantages over the likes of Fimo and Sculpey – it doesn’t require baking, it adheres firmly to almost any surface and it ends up being far stronger and far harder. On the other hand, it has a faintly unpleasant petrochemical smell, requires a bit more work and tends to work out more expensive (at least in Europe).
The putty starts out in two parts, a resin and a hardener, and you need to thoroughly mix and knead them before you start. This is probably best done with gloves really (at least according to some sources) but I’ve been doing it bare-handed so far without any obvious ill effects. As soon as it’s mixed, it starts hardening – on average, you’ve only got a couple of hours to work with it before it’s really hard, and in the first hour or so it goes from being distinctly on the floppy side to being really very firm; depending on what you’re making, the firmness might be very desirable or a big pain.
Me being me, the first thing I made was a cat. This was fun, and went fairly smoothly, but it brought out what to me is the most striking difference between epoxy putty (at least, A+B) and the polymer clays I’m used to: It’s near-total lack of elasticity. It’s one of those things you don’t think much about until it’s gone, but it turns out to make a big difference. I started to extrude limbs in the way I usually do when I make cats, and found I kept needing to smooth over the cracks I was making as I went.
One advantage of this is that things stay where you put them much more readily than they do with polymer clay, which sometimes springs back into place a little. Also, the putty is very quick to bear the impression of anything that presses against it, which is potentially very useful even if it isn’t always desirable. It’s not sticky to the touch, despite its excellent adhesive qualities when left in place – but it did prove sticky enough to easily attach little beads for eyes, which is handy given the limited range of colours I currently have available.
Once it’s cured it has a pleasing weight to it, and it’s really good and hard; it feels altogether far more substantial than polymer clay, and it’s easy to beliebe what I’ve read about its vastly greaters strength.
After the cat I still had lots of putty left over which I needed to use before it set hard, so I set to work making a human face. Humanoid, anyway… the squishiness of the material tripped me up a bit here – it is putty, and it feels and works like it. The head came out okay in the end, but it’s sort of… meltier than I’d really intended.
I regretted not leaving the putty to firm up for a while before trying to do something like that, but then when I did leave a bit more to harden, I ended up going away for too long and it was almost impossible to work! We live and learn though, and I always expect to make mistakes when I try out a new medium.
I made the same mistake again when I tried out the bright read Super Carve I bought – it’s noticeably a good deal softer than the A+B, and the dinosaur I made kept sagging gently to one side or the other for a long time after I first made it, as if it was drunk and sleepy. I straightened it up repeatedly, but in the end it still sort of slopes forwards and to one side; it’s alright, it mostly just looks like it’s staring at something much smaller than itself, but I made sure to leave it for about half an hour before I started working on my next project – a big dragon, to which I will return once it’s finished.