This tunable tolerance tetrahedron twist timewasting toy thing was inspired by http://www.thingiverse.com/thing:186372 . The problem with that thing was that it was just an STL file, with no means for adjusting the "fit" tolerance or scaling. So, one of the students in my lab, Zachary Snyder, spent valuable should-have-been-studying-for-final-exams time on deriving his own formula for it in OpenSCAD... and then I spent too much time trying to print it with various parameters and tweaking the design. Oh yeah, it also can take a shockingly long time to solve the puzzle... especially shocking given that it's just two pieces!
The 20160630 version has a few minor, but significant improvements. The original version uses a turn of 1.0, which makes the parts not fit with those from the new design unless tenth_turns is set to 10 rather than the new default value of 12.
| tttttt20160512.scad.original | 20.0KB | |
| tttttt20160512.stl | 3.6MB | |
| tttttt20160512_1mm.stl | 937.4KB | |
| tttttt20160630.scad | 20.4KB | |
| tttttt20160630.stl | 3.4MB | |
| tttttt20160630k.stl | 456.0KB | |
| tttttt20160630noUK.stl | 3.0MB | |
| tttttt20160630noUK1.stl | 397.2KB | |
| tttttt20160630u.stl | 430.6KB |
