Belted extruder

thingiverse

Simple belt-driven extruder, originally designed for the Geeetech i3, was inspired by Itty Bitty Belted Extruder and Belted Extruder v.3 for 1.75. Important notice! The hobbed bolt used in this extruder is shorter than a standard M8 hobbed bolt. To maintain the small size of the extruder, I employed a regular M8 hobbed bolt, filing its head and threading it as shown in the picture. This method works, but the generic hobbed bolt has a smaller diameter than 8 mm, creating a small gap (this can be solved with a layer of sellotape). You could use a standard hobbed bolt, but you would need a standoff. BOM: * 4x M3x5mm - for stepper * 2x M3x30mm - for tensioner * 1x M3x20mm - for guidler * 2x springs * 3x M3 nuts * 8x M3 washers * 1x Push-fitting with 9mm diameter * 1x 16-GT2 pulley * 1x GT2 Timing belt 180mm/90 teeth (can vary slightly) * 3x 608 bearings * 1x Nema 17 stepper motor * 1x Shortened M8 hobbed bolt * 2x M8 locking nuts The top part, which enables mounting, is available at Geeetech z-axes top and bottom mount.