I've seen enough to know where this is going...oh, just kidding.  It's a rhombic dodecahedron.  With an exotic symmetry group.  That's all.  Really.

From above, a classic Egyptian scarab; from below, a real scarab.

The scarab is in a typical defensive posture, legs folded. As a result, it presents a strikingly different aspect when turned over.

This model is scaled to fit well in the hand, and because of the folded posture, is robust enough to travel well in a pocket. Mine goes with me everywhere. Warning: the claws are as sharp as they look.

Sorry, this size is no longer available
Please go here for the large version


A delicate free form model dubbed "Holey".

Makes for some nice Christmas decorations :-)

Minimum thickness is around 0.25 mm on the inside struts.
Prints perfectly in Strong & Flexible, might get bend a bit during transport, but you can bend it back gently if you hold it in warm/hot water.
The tips are sharp and fragile, so please handle with care.

Dodecahedron like structure with five balls moving freely within its Voroni hull. The sound and feel of the balls inside makes playing with it a lot of fun. The structure is very robust and still flexible enough to bounce off the floor.

This radiolaria-like object started out as a simple cube which has undergone several iterations of fractal subdivisions, each with a small amount of displacement applied. Next the edges between each point have been traced volumetrically and then smoothed in order to create this final form - the lattice representation of the original mesh.

More images in this flickr set:
http://www.flickr.com/photos/toxi/sets/72157624686695647/

This model is also available bigger (150mm diameter):
http://www.shapeways.com/model/145391/lattice_20100813_173314_150mm.html

The Fire Gauntlet is an articulated hard-shelled glove, 3D printed all at once, fully assembled. The model is based on a 3D scan of my hand, with a 1.5mm clearance between the scanned surface and the printed model to allow for a Nomex cloth lining. Ideally the final design would be in stainless steel, but there are many challenges to making that happen. This prototype is a good start.

This version is only for display and is bonded to the production frame. It was printed using White Strong & Flexible material, painted and mounted on a wooden base.

Warning: this is an old but functional version. Check the newer version at:
http://www.shapeways.com/model/146656/universal_ring_dial_2.html

This Universal Equinoctial Ring Dial is a portable and self-orientating sundial. You can see how a similar dial works: http://www.sunwatchmaker.com/instructions.php .

You''ll get in position the meridian ring, the equatorial ring and the central bar. The eyelet must be inserted through the "jasolo fecit" part of the meridian ring. The slider is entered through the slit of the central bar and then it is turned with a little force.

For finishing, dip the model a couple of hours in cold tea (hot or warm tea will deform the model). Later, paint with black ink the marks and once dried, remove the ink with a wet tissue (ink will remain on the marks).

This is a working demonstration of a mechanical iris diaphragm.

WARNING :- Please note the tolerances are a bit tight and depending on print orientation it may require a bit of cleaning.

Will post photos and videos later.

Early Video :- http://www.youtube.com/watch?v=fLSfJjS7QUE

Better but short video :-
http://www.youtube.com/watch?v=GXf9ck0LAYo

Update: Jury 1st Prize winner at the 2011 International Puzzle Design competition

Two open-ended Superstrings with the correct spin can be merged into a super-symmetrical cube.

The idea for this puzzle emerged when I was designing shapes based on two interlocked tetrahedra.  Inspired by ideas from 'string theory' and 'super-symmetry', I began to search for shapes that were both symmetrical and as similar as possible.

Taking the two pieces apart is not too difficult; reassembling them back into a cube can be more challenging. Hold one of the pieces still; move the other piece through the correct sequence of lateral and rotational moves.

Two colour dyed version in a perspex display case available from Etsy.

Reviews of Superstrings by puzzle enthusiasts from around the world.

"Another great little pocket puzzle from Richard Gain" - Allard Walker - Puzzling Times

"I can't really think of any downsides with this one, it was an elegantly designed puzzle that was fun to solve. Well done, Richard!" - Brian Pletcher - Mechanical Puzzles

"An attractive tactile puzzle with a decent challenge but not too awful - a really good addition to my display." - Kevin Sadler - Puzzlemad

"This is a really tough puzzle, and I can see why it won favor with the judges at IPP. Much easier to take apart than it is to put together, Richard can be rightly proud of this one." - Neil Hutchison - Puzzling Parts

BIG GUN WARSHIP COMBAT PUMP. Hose inside diameter 6mm. 4 Litres per minute using a 6 volts SLA battery. Max motor size to suit pump. Motor shaft 2.3mm diameter x 13mm length max. Motor bearing 10mm diameter x 3mm high max. Mounting hole centres 16mm. Requires 7 - M2.6 x 6 long screws.

Medal is a mechanical puzzle maze. The object is to turn the two maze plates and to pull the metal apart in four pieces.

A mechanical device for braiding 3 threads

A advanced alien starship.

Working Suspension Ø12x43mm

For Frosted Ultra Detail

Full Color Mt. St. Helens model, size: 10 x 8 x 1.6cm

The skull of a rat.
Main skull and lower jaw are two seperate pieces.
This model is ca. 11mm long, sized to be used as the Skull of rat man ("skaven") in fantasy miniature "28mm" scale. Please be aware that at this size, parts of the model will be very thin and may be breakable, so be careful to choose a material appropriate to the intended use.

Please note that I also offter different sizes:
Real rat skull, about 45mm.
Mouse skull: ca 24mm.
For use in jewelery: ca. 15mm.

A rodlogic gate as featured in
Drexler, K.E. Nanosystems: Molecular Machinery, Manufacturing, and Computation.
New York: John Wiley & Sons (1992). (Chapter 12)
http://e-drexler.com/d/06/00/Nanosystems/toc.html

Mainly usable for demonstration purposes of logic gates.

The nobs on the lower side should be compatible with lego-technic.
The basis cubic grid size is 3mm.

It's untested, so ordering is blocked for now.