Extruder lower block for Deltaprintr

thingiverse

This replacement for the Deltaprintr extruder's lower section provides a guide for filament so it can't push out sideways when there's a little resistance. It helps immensely for printing soft filaments, like flex PLA or wood. Inspired by Valentin's replacement for my original replacement extruder floor. This was modeled from the ground up in (freely-available) OpenSCAD and pushes a little further into the gear area than Valentin's version. The OpenSCAD source file is included if you need to tweak tolerances for your printer. Everything's commented, you should be able to figure out which numbers to tweak. When assembling, try to push the ridge with the filament hole up as close to the bearing & gear as possible while tightening the screws. You really want it pushing up there so the filament doesn't have any wiggle room between the gear and the filament guide. If you use the "with tube" version, you'll need to insert a short (~13mm or 1/2") section of 4mm PTFE tubing into the hole above the push fitting. It'll stick up into the V between the drive gear and the pinch bearing. You'll need to use a knife to whittle the tube into a point that fits between the two surfaces as closely as possible. Whittle and test fit, whittle and test fit. TIP: You can cut a piece from your bowden tube for this; it's plenty long enough. Updates 2017.05.25 - Adds teflon tube option. Tightens up gaps around drive gear. Print Settings Rafts: No Supports: No Infill: 20% Notes: For Cura: Disable support Top/bottom thickness 1mm+ Shells: 1.2mm+ (i.e. 3+ shells) Fill density 20%+ Minimal layer time 10s+ (helps with small top layers) Cool head lift: enabled (helps with small top layers)