M12 extruder bolt or axle hobbing tool

thingiverse

Here is the rewritten text: Tool that helps make 12mm hobbed bolt or axle for a filament. Bill of Materials (BOM) Printable Part: hobbing tool, 1pc Hardware: DIN 618 hk1210 bearings, 2pcs Print Settings Printer Brand: RepRap Printer: prusa i3 Rafts: No Supports: No Resolution: 0.2 Infill: 25 Notes: Use a 230C hotend and 100C heatbed. Apply a 15-line brim. Post-Printing Instructions Clean the print thoroughly. Press-fit bearings into their recesses. Clamp the part in a vice. Insert the bolt or axle using a dredging tool, then secure it with nuts. Drill an M3 hole using an electric drill with adjustable rpms. Apply drilling oil to the dredging tool and tap. Use machine oil or specialized drilling oil for best results. Never drill without oil; you'll only ruin things. Hold the drill perpendicular to the axle at all times. As the drill tries to escape, apply gentle pressure to the left side. Start with low rpms and gradually increase speed as needed. Keep the drill steady on the same spot to achieve consistent notching. Clean the dredging tool and tap frequently to prevent clogging. Repeat the process until the axle rotates smoothly for a few revolutions. Visually inspect the results; if some notches are too shallow, re-tap that area slowly while drilling. After crafting two axles, it's best to discard or reserve the bearings for hobbing only.