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Extruder motor rotation indicator (Prusa i3 MK2/MK2S/MK3/MMU2)

by Petclaud Feb 21, 2018
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Slightly absurd question but do you think these have ANY effect on the temperature of the extruder motor? Weather by air movement or added mass?

Hi. No that is not an absurd question :-)

Pls read the notes in my original design here: https://www.thingiverse.com/thing:2638857. Prusa confirmed this is not a problem, in fact Prusa also published an article about this design on their website here: https://www.prusaprinters.org/visualize-extruder-motor-movements/

NEMA (extruder) motor rotation indicator (Prusa MK2(S)/MK2.5/MK3/MMU2)

Hi there, I'm trying to print this and am having a whole lot or problems! I am using a Prusa MK2. Could you please explain to me some of the settings that you might have set up with your printer for this to print because I'm getting a stringy mess! I've tried printing at a normal speed of 100, I've tried printing at a speed of like 20 and no matter what speed I choose, it sucks! Granted I'm new to this, I could use all the help I can get. I don't know if it's a temperature setting, if it's a slicing problem, printer setting issue? No clue. Any and all help is grateful. Thanks

Hello. It certainly is not the model, although this one might be a bit more difficult to print. As mentioned in the description, you likely have to print this one very slowly, maybe just some 10 to 15 mm/s. Anyone new to 3D printing, I can recommend to read and test a lot. Obviously read the Prusa websites / manuals. Also these ones provide some good pointers: https://all3dp.com/1/common-3d-printing-problems-troubleshooting-3d-printer-issues/#Under-Extrusion and https://www.simplify3d.com/support/print-quality-troubleshooting/.

Good luck.

This is a fantastic design, I love it. The only minor issue is that the circle on which you superglue the magnet is not thick enough. So if you glue on a 8x3mm magnet, the turbine doesn't move with the motor. I got around that by adding an extra magnet. Perhaps add an extra mm of thickness to the circle at the center?

Hi, thx for the feedback. I have not experienced this and in fact this is the design I am running on my printers as well. It might be a tolerance issue, but more likely - at least this is what I expect - it might be that the blades have curled up a little and are not 100% horizontal and parallel with the print bed anymore (during printing) and hence touch the motor housing once a magnet is glued to it. Or maybe the magnet is not exactly 3 mm thick?

I think it's the former -- the blades are not fully horizontal. It's not a big deal though because with the extra magnet it works just fine.

I only have 6x2 magnets :/ Any chance to make this for that size?? LOVE this design!

I cannot recommend small magnets, since these might slip. I tested also with 6 mm magnets and that didn't work either

I have rigged it to work with the 6x2 neo magnets and so far working good. Just wish it was designed for it. Maybe with a capture spot for the magnet instead of just a flat spot?

Where can I find the layer fan shroud shown in the picture?


Hi. The designer called it an "intake funnel" and it can be found here: https://www.thingiverse.com/thing:2718992

Intake tract/funnel for print cooling fan

Great, thank you!

Totally was looking last week for something cool for this exact purpose, and you have nailed it!, Thanks

Thx. Enjoy!