Servo driven nozzle wiper arm for delta printers
by fjohn624, published
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I like having a dump area on my 3D printers so they can prime the extruder, wipe the tip on its way to the print surface and immediately start printing without all the extra hairs and globs. Worked great for my modified bukobot but on a delta you can't just have a longer axis to prime it off the table. This was my quick and dirty solution.
You will need to print 2 servo mounts, 1 arm and 1 clamp.
You will also need a standard size hobby servo. I used a Hitec 31311S HS-311 as its pretty universal and around $10 USD. I would recommend using the same one as the arm is made for the servo horn to snap into; I didn't even use glue on mine. If you have a wide selection of servo horns laying around print the arm and see if you have one that fits and then use another servo. Otherwise, hey it's only $10....
You will also need some M3 hardware and T-nuts for mounting it to the extrusions.
Last but probably the most important, you will need a piece of material to use as a wiper. In the video I was using a piece of folded up PET tape. While it works, the better material to use would be a piece of high temperature silicon mat, similar to what is used on nice kitchen spatulas.
After you have it installed you will need to set it all up. I have attached my starting g-code. DO NOT use it as-is. It is just an example and you will have to modify all of the positions and servo angles to fit your printer. Set the height of the Z so that it is higher than the plastic printed arm but lower than the silicon wiper blade.
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Servo driven nozzle wiper arm for delta printers by fjohn624 is licensed under the Creative Commons - Attribution - Non-Commercial - Share Alike license.
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