ThinkFun Nut & Bolts

UPDATE Sept 22, 2015: Nut-Shrink-Compensated-1 printed in ABS fits the bolt fine. Nut-Shrink-Compensated-2 can be used with factory M8 bolt. If your filament doesn't shrink at all you can try to print Nut.stl...

These parts were specially designed to ruin the concept of an easy plug and play construction set and force kids to think as engineers. First part of my evil plan are nuts and bolts.

PS: Actually original parts are just refuse to insert to each other because I used ABS to pr