Handheld drag knife / cutting pen for vinyl and paper

thingiverse

This is a very comfortable rotary cutter using a MR148ZZ bearing which I had on hand. The blade is a 5mm diameter craft cutter from eBay. The printed insert adapts the 5mm blade to the 8mm ID of the bearing. This setup means you can cut designs without having to turn the workpiece or the blade direction as it will rotate automatically as it follows your hand movements. I printed this at 0.1mm layer height using 4 walls and 4 top/bottom layers. I tried lightning infill on this model and was pleasantly surprised at how it came out.