Alex Extruder 1.75mm

thingiverse

ATTENTION: I no longer update files on Thingiverse; download the latest version from my OneDrive: [https://1drv.ms/f/s!ApLXJJfQAWPfgnMTI4TwPZj\_Js11](https://1drv.ms/f/s!ApLXJJfQAWPfgnMTI4TwPZj_Js11). After searching for a 1.75mm filament, I designed my own geared 4:1 extruder that works with various materials like ABS, PLA, Nylon, and PET. It's easy to assemble and has a low hardware parts count. Download the appropriate extruder for your hotend, gears, and idler. Check Assembly Instructions for further details. If you need an extruder for another hotend or hobbed bolt/pinion diameter, leave a comment below. Hotends supported: Bowden, E3D V4/V5, Magma, JHead Generic, Sethi3D, 3DMachine, Movtech. To print the required parts, download the correct version for your hobbed bolt/pinion diameter. The files are named as follows: Alex-Extruder\_[Effective Hobbed Diameter]\_[Hotend]. For example, Alex-Extruder\_8mm\_E3D is for E3D hotends and 8mm hobbed bolts (effective diameter of 7.6mm). You need four printed parts: the extruder for your hotend, idler, hobbed bolt gear, and motor gear. All files can be found in the ZIP package. The Washer.stl is optional to tighten the 8mm hobbed bolt with a nut. For the extruder, there are snap-fit mounts for specific hotends like E3D, requiring no bolts (a hole for a holding bolt is provided if desired). The same applies to the hobbed bolt; two versions are available - one for an 8mm hobbed bolt and another for MK8 pulleys with M5 bolts. For the idler, you need: - 1x 625 bearing - 1x M5 x 25mm bolt to mount the bearing - 1x M3 x 25mm bolt to mount it in the Extruder - 1x M3 x 40mm bolt for the spring - 1x clothspin spring (refer to pictures) For the extruder, you need: - Your preferred hobbed bolt or pinion + bolt - 2x washers for your hobbed bolt - 2x 688 bearings for an 8mm Hobbed Bolt or 625 bearings for a 5mm bolt - 1x M3 nut for the spring bolt - 3x M3 x 10mm bolts for mounting the step motor (optional washer and nut for the hobbed bolt) - Optional washer and nut for the hobbed bolt (M3 x 16mm bolt for holding the snap-fit hotend, optional 2x M3 x 25mm bolt for JHead Groove Mount hotend) - Pinion: M3 nut, M3 set screw (optional but recommended for long-term use) Assemble all parts together according to recommendations. Do not overtighten any bolts - just tighten them enough to touch their counterparts. For printing, use a layer height of 0.2mm, 3 or 4 perimeters, 20% infill, and a layer width of 0.4mm or less. Print external perimeter first for gears, and your printer should have bridging skills for the extruder assembly.