Extruder feeder with alternative runout
Description
**Edit: You should consider using [this newer version](https://www.thingiverse.com/thing:3800883) instead.** ==================== **(which doesn't require to reverse the stepper motor's wires anymore.)** --- **BEWARE: With this design, the motor is inverted.** So, you have to revert the plug, or adjust the settings in your firmware **(see below, or use [this extruder](https://www.thingiverse.com/thing:3741451))**. Here is my custom extruder feeder. I spend days on the design (thanks to my computer crashs...) and print several prototypes to obtain what I wanted: - Something usable with any 1.75 filaments, including flexible ones - A discreet design (not "cheap" as the default is) - With a place to put a better runout sensor switch - Including a cover to protect the motor axis from dusts - Easily openable to see the inside for maintenance There are 3 main parts + 4 small ones, I've included a STL file with all-in-one if you don't want to manage different settings for them. You will have to re-use the spring and the ball bearing from your default extruder feeder + its 4 screws. The only thing you will have to add (but you could use something else...) is the runout sensor switch + a plug where you can put the default runout cable (or you can weld directly if you prefer). I suggest to use thin wires as I've let space for it. I'm using this kind of microswitch: https://images-na.ssl-images-amazon.com/images/I/71hJwrQbcuL._SL1200_.jpg (you can find all dimensions in the FreeCAD file if you want to check) I personally printed it at 0.2 on my U30 with an old and cheap black filament, with supports activated. You will probably have to spend a bit of time with a precision knife to remove printing defects + sand a bit some parts. Tip: Cut a thin strip of sanding paper, roll it to get like a small tube, put in in the hole for the filament and clean it with this "tool". FreeCAD: Please note I'm a beginner on FreeCAD (about 1 month on it), and my computer is very old (2009 !), so the source FCStd file is not perfect and heavy: I had to make more sketches than necessary because sometimes I cannot edit other ones without my computer crash... Feel free to clean the file and send me a better version. Remixes: I share all my designs with the default license, so you can modify what you want. But I will really appreciate you mention the original design if you do it. ;) If you like this piece, share it and leave a comment.
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