The Original Prusa i3 MK3 is the successor of the award-winning Original Prusa i3 MK2 3D printer.

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Heatbed Power Cable Cover

I have the i3 MK3 Kit and am working on guide 7. I have the heatbed that requires the power cable to be attached with screws ( M3 X 10 ) and nyloc nuts. The cable cover leaves the screw heads exposed and subject to being shorted out. What is the recommended fix or cover to prevent an accidental short circuit of the heatbed?

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Hello Jack,

There is no need to cover the bottom part. Those screws should never get in direct contact with each other on their own.

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Hey there! I’m not from the Prusa Support team but may be able to help.

First of all, do you have another printer that works (assuming that you haven’t finished assembly yet, that is)? If not, I would wait until you’re done with assembly. I found a file on Thingiverse that has a double-sided cover plate for the heatbed cables. However, it’s at a 60-degree angle, which shouldn’t change much (it was designed to be for an enclosure where space is limited). I haven’t used it, but I’m pretty sure the screws are covered completely.

In the about 5 months that I’ve owned my MK3 MMU2, I’ve never had a short. However, it’s not impossible, so if you’re looking for unofficial advice, here it is.

I hope this helps, and good luck!


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Jack Hogan will be eternally grateful.
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