MXL Belt Bowden Extruder 1.75mm

thingiverse

This is a remix of a solid design by pefozzy. I liked that it supports the hobbed bolt really well with 3 bearings as opposed to two in conventional wade extruders. I also liked the belt driven aspect. One problem I had was sourcing the closed loop belts in the US. My solution was to use MXL belts since they're cheap and easily available. I used a 95MXL belt from McMastercarr for $2.70 a piece: http://www.mcmaster.com/#mxl-series-timing-belts/=uwpq7n. I found on my lab robot/3D printer conversion project I needed a bowden setup so I redesigned this as a bowden extruder with bracket for attaching to any frame. I also made the design more suited for 1.75mm filament since the original one didn't compress the filament enough. I used an aluminum GT2 pulley for the motor, but I've added a printable 20 tooth MXL pulley. Instructions Parts list: Non-Printed parts 2 x 40 mm M4 Hex screws 2 x 5/16 (8mm) x 1.5" (38 mm) springs 1 x Standard 8mm hobbed bolt 1x 8 mm locknut 1 x 95MXL Belt 1 x 20 tooth GT2 Pulley 4 x 608 bearings 1 x 2mm x 1/8" Pneumatic fitting for bowden tube M8 washers for spacing pulley