Planetary gearbox extruder 1.75mm

thingiverse

Archive model. Not recommended for repetitive applications. New extruder available: https://www.thingiverse.com/thing:2658691 Direct extruder designed specifically for my new 3D printer project. The extruder fits Nema16/Nema17 stepper motors with planetary gearboxes and any gear ratios. My stepper motor is a Nema 17 model with a planetary gearbox and a 5:1 gear ratio. The stepper motor part number is 17HS13-0404S-PG5 from StepperOnline. The extruder is compatible with the Nema 16 motor, which has an identical size gearbox, but with a smaller shaft diameter (8mm). For this application, I will use a short-distance E3D hotend, and as such, the bottom side of the extruder has a mounting groove. Additionally, the lever includes a placement for a dust filter sponge. You can also utilize a Mendel mounting plate model for your 3D printer (not tested): http://www.thingiverse.com/thing:511681 Instructions: You will need the following components: * Extruder gear with a feeder roller bore diameter of 6mm. + Note that my initial extruder gear had a smaller bore diameter, so you may need to ream it up to 6mm. * A V625ZZ ball bearing with a V-groove design. * Four M3x30mm bolts for assembly. + It's recommended to have one bolt with a screw thread only on the first 8-10mm. + You can make this modification using an M4 bolt, as I did in my lathe workshop. * A single M3x20mm bolt and an M3 hex nut for attachment. * Five M3 plain washers for assembly purposes. * Two 40mm countersunk head screws with a diameter of 40x40x20mm to secure the fan housing. * An 17mm shaft with an outer diameter of 5mm for attaching the ball bearing. * A spring with an inner diameter of 7.5mm and outer dimensions of 8.1-15mm. Before assembly, make sure to insert a small PTFE tube with an outer diameter of 4mm as a filament guide under the gear.