Original-Prusa-i3
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prusa3d
Hotend wires get damaged due wrong cable-holder
Lately I got a several MK3 upgrades in service, it happens they all run into the problem where the hotend wires get too low and hit the heatbed cover bolt where the bolt-end is facing up.
Here someone already started a discussion about this with a good photo showing what happens.
https://www.reddit.com/r/3Dprinting/comments/b9dxhc/just_noticed_that_the_red_wire_coming_out_of_the/
Again, I am willing to help developing on improvements. Just need the right files and workflow.
Simple modification, I have changed the heatbed cable cover to use the problematic screw flipped around. So now you put a nut on the underside, screw goes in from top-down, and sits counterbored inside the printed part to avoid the sharp end of the bolt sticking in the air and causing this problem. SCAD and STL files linked below.
https://drive.google.com/drive/folders/1wAVW9g4GOHe4tTdY2j6lgEapmjQKBeSA?usp=sharing
That is one part of the solution, will add the second solution to the cable holder later this evening.
Side-question, isn't it better to add the files in a pull request instead of Google Docs?
Probably so! I have never made a full request before, don't know how to do it. Also I think Prusa has reasoning to leave the screw entering from the bottom - it leaves less chance to create a short circuit accidentally between contacts on the bed if someone were inserting/removing screw while bed is powered. So not sure they want to change the file.
On Mon, May 20, 2019, 2:33 AM Marius van Witzenburg < [email protected]> wrote:
That is one part of the solution, will add the second solution to the cable holder later this evening.
Side-question, isn't it better to add the files in a pull request instead of Google Docs?
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We will go with similar solution as @austinvojta is suggesting, this is currently finishing tests and once goes to production it will be updated here - matter of days. It's already covered here atm https://manual.prusa3d.com/Guide/7.+Heatbed++&+PSU+assembly+(Black+PSU)/1153#s26163
This solves the heatbed issue but are there also working plans on the Xaxis body/cable guide? Cause this is actually the reason why the wires get ~1.5mm lower than in the previous version. Since the cable holder got removed from the repository I did not started on updating this part.
Another thing for the heatbed part is if you'd like I'd want to add in something to prevent short circuiting the heatbed wires.
@akukan there is a risk that, during maintenance, someone shortcut + and - of the heated bed with the wrench. Maybe you can keep your previous solution and add a washer on the screw head.
:satisfied: you know how that goes, we all went there I think... There is a safer way so why taking the risk?
As part as a solution to this without reprinting the heatbed cover yet till feedback from Prusa I restored and adjusted the cable-holder.
There is an extra cable tie and angled cut-off close to the body to keep the wires up.
@rrauenza no help needed, just didn't made one since my other PR's are not getting processed.
@rrauenza no help needed, just didn't made one since my other PR's are not getting processed.
For what it's worth, I did print yours out for my upcoming upgrade... Thanks for the change. You might also put it on thingiverse?
@rrauenza no help needed, just didn't made one since my other PR's are not getting processed.
For what it's worth, I did print yours out for my upcoming upgrade... Thanks for the change. You might also put it on thingiverse?
Uploaded here: https://www.thingiverse.com/thing:3733759
@akukan looks like you did in fact merge that change in, we can probably zap this issue!
e55953ff5189ca9b109a8d779e8a57ee6fd271e0
@draeath, @akukan Indeed look like it has been added... Just wondering, are you guys moving away from OpenSCAD?
Asking this because I see that the SCAD files are not matching with the current STL versions or the SCAD file is completely removed.