mk3.9 psu cover - customized for silver PSU
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This cover eliminates interference with the extruder cable support when printing at or near the z=0,x=250mm position.
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- Printables
- Kategoria
- Prusa Parts & Upgrades
- Licencja
- GNU General Public License v2.0
After my mk3.9 upgrade, in a random turn of events, Prusaslicer automatically laid out a model with a portion of the model near the x=250mm location on the build plate (z at or near 0).
Problem Statement: It is clear the cable support bracket interferes with one of the ridges in the PSU cover model when the extruder is at or near the build plate. Once the extruder is high enough for the cable support to clear this ridge, the full X-Axis is available. Note this condition is not caused by the support being twisted to one side, or by the zip tie itself. This incursion is present at least a couple millimeters into the body of the cable support itself. The result of this is that the extruder is violently forced leftward, which leads to a pronounced layer shift if you hit that point on the build plate.
Solution (I hope it is temporary): After speaking with support they decided to escalate and come back in a couple days after specialists review my case. Rather than wait on them, I decided to create this solution and document it here, just in case. I do not claim this is the best solution, or the right solution. I just declare that it fixed the issue for me. Note that if you slice the model as I did, you will be left with a thin wall (a couple extrusions wide) in the upper front portion of the inside of the cover. I left out the screw here because I didn't want to run a screw into any internals on the PSU. I left the wall there just in case it was important from a safety perspective, and because, well, It doesn't matter anyway, I don't think. You do not need to accept this solution, but if you do, obviously, YMMV. If you have also noticed this problem, I offer this up as a potential fix. Installation is a little bit aggravating but for me it is worth it. And it saves me the $100+cables+shipping to “upgrade” to the black PSU.
If support comes back and tells me there is a problem with my build, or offers a better solution, I will gladly point you in that direction instead. Until then, this is what I'm doing.
I set the license for this following the Prusa models on Printables.