Scalable to any ring size. The outside edge on this ring is a bit sharp and will require some adjustments. I have doctored mine with some sand paper. Shortly the model will be rounded a bit to take off the edge.
This 12 piece burr puzzle was found in a garage sale in the unassembled state. After several tries I assembled it. I've been told there are two ways to assemble the 12 identical pieces, but have never found the second solution. Assembled view shows solid model, yours will arrive white with hollow ends.
Needed this $10 part to fix my Flowbee... then the lights went on, and I realized I could have Shapeways make it for me for me. You may need this part for your Flowbee as well, so it is available. Once installed I had to file down the tip of the shaft about 1/8", add a drip of CA glue on the shaft when intalling, and now my Flowbee is working again. When you 'print' this part you get 2 that are identical.
This is designed to have a small 1/2" OD bearing inserted, and used as a heavy duty swivel on my spinning kite bols. The fishing swivels currently in use are not really designed for the workout my kites provide them.
Now you can carry around a miniature version of this ancient device. Google this subject and find that hundreds have been unearthed in Europe over the years. Were they used to size pipe, denote status, a weapon or just some obsolete tool? If you can figure out what they were used for you will be famous. The sides on this are very thin, but mine hasn't broken yet.
Andy's models is a collection of computer generated models. Most are not made in a CAD system, but are instead the output of a computer program. In the past they could only be viewed on a screen. Now with the magic of 3D printing the actual object can be produced. I'm so delighted to be able to turn the designs into a physical objects!