Pitbull Flexible Extruder

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 (in 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

Category: 3D Printer Extruders