MXL Belt Bowden Extruder 1.75mm

thingiverse

This is a reworked design by pefozzy. I appreciated that it supported the hobbed bolt well, especially with three bearings instead of two found in conventional Wade extruders. The belt-driven aspect also appealed to me. One challenge I faced was sourcing closed-loop belts within the US. My solution was to utilize MXL belts as they are affordable and easily accessible. I opted for a 95MXL belt from McMastercarr, priced at $2.70 per piece: http://www.mcmaster.com/#mxl-series-timing-belts/=uwpq7n. On my lab robot/3D printer conversion project, I required a Bowden setup, so I redesigned this as a Bowden extruder with bracket for attachment to any frame. To suit 1.75mm filament, I modified the design to ensure proper compression. For the motor pulley, I used an aluminum GT2 pulley and included a printable 20-tooth MXL pulley. Parts list: Non-Printed parts * 40 mm M4 Hex screws x 2 * Springs x 5/16 (8mm) x 1.5" (38 mm) x 2 * Standard 8mm hobbed bolt * Locknut * 95MXL Belt * GT2 Pulley with 20 teeth * Bearings: 608 type x 4 * Bowden tube, with Pneumatic fitting 1/8" x 2mm x 1 inch long