Mostly Printed CNC ACME Nut Bracket

thingiverse

DO NOT USE! Tested and failed, the 5/16" SS rod provided almost no backlash, which allows the Z axis to float about 0.25mm when cutting fast, leaving a rough surface. Might work well for a 3D printer or laser cutter build, but any sort of spindle will jump. NOT TESTED! Still waiting for my ACME Nut This is designed to fit the C Center carriage for the MPCNC, replacing the threaded rod and coupling nut with an acme screw. The ACME Nut from eBay should slide in, but it will be a tight fit. Recommend (carefully) heating the ACME nut to ~230C and seating it by re-flowing the ABS. Less play means less backlash. The fit must be very snug. This is the soul of your machine! Hardware: 4x M3x20 Panhead bolts 4x M3 Locknuts Again, this has not been tested yet; just a rough draft. Print Settings Printer: CTC Bizer MK8 Rafts: No Supports: No Resolution: 0.2 Infill: 55% Post-Printing Because the nut holes on the bottom are bridged, you will have to clean the bottoms of the holes. Personally, I use an M3 nut wedged on a soldering iron set to 230C and push it into the holes slowly; re-flow the poorly bridged material to make a nice clean surface. How I Designed This Designed with OpenSCAD by importing the existing part and filling the holes with cylinders to confirm center. Source file included.