Cardboard fold roller

What is it for ? 

I designed this fold roller (I know it looks like a pizza cutter ^^) to make clean folds on cardboards.

Hardware needed :

I used a section of brass cylinder (external diameter : 5mm, internal diameter : ~4mm) to act as a bearing and prevent the wheel to wear out too fast on the screw.

Designed for M4 nuts and screws (it requires 3 of each), I used a nilock nut on the wheel to be able to lock it without tightening it too much. It allows the wheel to roll freely.

Printing:

I printed it with PETG for longevity but I guess it should work fine with PLA
Printed with a 0.3mm layer height without supports.

No post processing needed except fastening the 3 parts together with nuts and screws.

Tips : 

When using it in the same direction as the cardboard 'grooves' don't press it too hard or it could cut into the cardboard. After a few tests I realised you don't have to press it really hard in any direction to make a proper fold, even on thick cardboard.

Let me know how it works for you :)