Pitbull Flexible Extruder

thingiverse

Extruder for rigid and flexible 1.75 mm filaments, compatible with Nema 17 stepper motors. Version: **3.4** **Print settings (Cura):** - material: **PETG** (don't use PLA, it will deform over time under mechanical stress) - layer height: **0.15** mm (slider) & **0.2** mm (housing / cover / tensioner) - wall line width: **0.4** mm - wall line count: 3 - top/bottom layers: 4-5 - infill: 20% - inner/outer wall speed: **25** mm/s (don't print too fast) - combing mode: off - cooling: 25% - support: **NO** **Hardware:** - bearing 12x4x4 (out x in x height) x1 - bolt M4x10 hex head x1 - bolt M3x22 hex head x4 - bolt M3x10 hex head x1 - nut M3 x1 - extruder spring 20x7 or 20x8 x1 - extruder gear T40 11x5x11 (out x in x height) x1 - PTFE 4mm tube coupler M6 x1 - PTFE tube 40-50 mm **Assembly** (follow photos) * Print all parts (ideally in two favorite colors) * Sand any roughness in top of printed parts (if necessary) * Clean filament path with 2 mm drill * Clean bearing hole with 3-3.5 mm drill * Insert bearing with washer (from top) into slot in slider and secure with M4x10 bolt * Assemble tensioner with M3x10 and M3 nut * Insert tensioner into slider * Insert slider into housing * Put spring into slider * Put cover on top of housing * Screw coupler into either side of slider * Insert PTFE tube into opposite side of slider * Put extruder gear into stepper motor shaft * Put extruder on stepper motor (don't use printed spacer if there's wide round hole in motor bracket) * Secure extruder with M3x22 bolts * Tension spring with hex key to middle of channel **Happy printing with any filament** Check out my other designs: https://www.thingiverse.com/DaVinci2000/designs