FabX 2 Extruder Support

thingiverse

FabX 2 machines use a Buda Schnozzle v2, which is likely a Chinese variant, mounted several millimeters below the extruder assembly. The gap between them causes flex filaments to flex occasionally, making it difficult to print with them. The FabShield closes this gap, providing an almost seamless path for the filament to pass through. This support has been designed to be used in conjunction with additional PTFE (or similar) tubing, approximately 14.2 millimeters in diameter and 4 millimeters in outer diameter by default, to provide a smoother path for the filament. Print Settings Printer: FabX 2 Rafts: Doesn't Matter Supports: Doesn't Matter Resolution: 0.2 Infill: 80% How I Designed This I created the initial version by measuring the top of the Buda Schnozzle with a pair of calipers and then modeling based on that, but it turned out to be fairly inaccurate. For the second version, I found the Buda Schnozzle v2.0 drawings published by Lulzbot (https://devel.lulzbot.com/Budaschnozzle/v2.0/), which helped fix the dimensions to some extent. I made a drawing in AutoCAD and then extruded it to get the final 3D shape, which turned out pretty well except for needing a bit of Dremel work at the corners to make it fit properly. I created the third version from scratch in OpenSCAD based on the official Buda Schnozzle drawing. This fits well enough at the bottom against the screws but may need a bit of Dremel work at the top to better fit against the extruder gear and idler. If it doesn't fit well, it should be easy to modify since it's an OpenSCAD model. Version four has additional grooves to better fit with the extruder gear and idler and some customizations specific to my machine which has a PTFE tube that protrudes out of the hotend.