MiseryPusher: Geared Stepper filament pusher for MK5 extruder

thingiverse

This retrofit stepper design is perfect for those looking to replace their DC motor filament pusher. It utilizes the MK5 hot end and offers easy cam opening for inspection or cleaning. The stepper motor allows for Skeinforge 35 reversal module usage, ensuring your prints aren't subpar. The lever design provides mechanical advantage and super easy operation while pushing hard on filament. The design includes a 13.6:1 geared stepper motor from MakerGear and a stainless MK5 drive pulley. It also uses support bearings and all four motor mounting bolts, and can be attached to the MK5 plexi bridge using original hardware. Two 6-32 x 4" screws, two springs (SC-419), and reused old MK4 bearings are required. The design is in OpenSCAD format and includes STL files for building. It features a video demonstration on YouTube, and the extruder is working at the moment. The design combines various elements from other pushers, featuring a grooved rolling idler with bearing, MK5 drive wheel, 13.6:1 MakerGear stepper, over-center lever, and spring tensioner. A detailed PDF guide (21 pages) is available for build instructions, but the process may require waiting, using an SD card, going to hardware stores, cleaning up parts, and gluing or clamping. High-resolution curves in the OpenSCAD files may slow down skeinforge processing, so building from the SD card is recommended. If springs are too tight, causing filament deformation, adjust accordingly. The ZIP file includes OpenSCAD files, two STL files for building, and a 53MB PDF guide. Patience is advised during the build process.