Automatic knife

thingiverse

https://youtu.be/kANP4qNV07I These should be printed in PLA for optimal results. PLA ensures rigidity and a smooth surface that allows the blade to slide effortlessly. Top & bottom: 2 perimeters, 25% infill, 0.25mm layer Blade, catch, and blade pin: 3 perimeters, 30% infill, 0.25mm layer Requires 3 short pieces of 3mm filament, approximately 15mm long. 4 each M3 x 20 socket head cap screw & nut. Not all rubber bands are created equal; the better ones to use are Plastibands, orthodontic elastics, and EPDM ones. These types typically last for about 30 cycles before breaking down. The Plastibands stretch out before they break, lasting around 20 cycles before replacement is necessary. The EPDM ones perform best, lasting approximately 26-30 cycles before breaking. This design consists of 5 pieces and should take 5-6 hours to print. Don't over-tighten M3 screws; excessive tightening can cause binding issues.