Triangles and pentagons that snap together.

Includes OpenSCAD source files.

Examples in the photos were printed on a Makerbot Replicator 2. You might need to adjust the size of the snapping nubs if you're using a different printer or material.

Inspired by these things, but incompatible with them:
http://www.thingiverse.com/thing:51465
http://www.thingiverse.com/thing:5961

This thing is also on GitHub:
https://github.com/longears/polygon-construction-toys

Available for purchase on Shapeways, but unfortunately it's really expensive:
http://www.shapeways.com/model/1112999/polygon-toys-triangle.html
http://www.shapeways.com/model/1113000/polygon-toys-pentagon.html