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SIX DAYS LEFT. The TRI bracelet ( Day 320 ) is back from Shapeways ! It's delicate but very beautiful and came out perfectly. You c...

Today we modified the code of the hinge/snap Tetrahedron net from Day 353  to make an Octahedral net. Here are two copies, one unfolded and ...

I can't believe it took me this long to get around to printing an iPhone stand. Phone cases and stands are the first thing that most of ...

Today we had a visit from  Rebecca Field , JMU mathematics professor, co-author, long-time friend, and fellow member of the Female mathemati...

Today we continue Fred Hohman 's guest post from Day 355 , in which he will print the knot fibrations he constructed yesterday... Now ...

One thing about living in New York City is that you get a lot of guests. Lots of people come to the city and hotels are too expensive even t...

Today (August 15) I had the great pleasure and honor of attending the final convocation for the 2014 NYU GSTEM program. At this event, 41 y...

Today we modified  Day 344 's Cube net design to make a Tetrahedron net: Here it is mostly folded up. This net is so small that it...

Today we printed designbynumbers' Center of mass manipulatives for calculus classes  from Thingiverse. It worked very well and balanced ...

After richgain 's excellent guest posts walking us through Burr Tools on  Day 348 and  Day 349 , we couldn't resist giving it a tr...

When three bubbles intersect, they do so in a very specific way. Here's what it looks like: Using the OpenSCAD code for this design...