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Extruder cable holder rubbing against back belts  

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TJH
 TJH
(@tjh)
Trusted Member
Extruder cable holder rubbing against back belts

I just finished assembling my XL and noticed that the back of the extruder cable holder (the part that screws to the frame) is basically rubbing against the back belts.

Pretty sure I have all installed/tightened properly. Is this normal?

 

Posted : 22/09/2023 8:57 pm
MIRE
 MIRE
(@mire)
Active Member
RE: Extruder cable holder rubbing against back belts

It's for me the same. I was observing it for a while and I think there is still a very small gap, but I'm not sure if it stays like this, when the material is aging. I'm wonder why Prusa make it this way as there are many better design solutions. However I printed a small spacer clip which maintains the distance. 

Posted : 23/09/2023 8:32 am
MME liked
jF
 jF
(@jf-2)
Trusted Member
RE: Extruder cable holder rubbing against back belts

From my experience, I would bet it's not fully inserted into the extrusion.

The fit is very tight with the paint on the extrusion and even when it felt like it was super tight on my side it was still not inserted fully and would wiggle when the tool was parked. Either the bottom was in but the top was not and the dock was tilted back or the opposite with the tool tilted toward the bed.

There a "teeth" that need to be fully inserted into the extrusion, I had to move the dock back and forth while I was tightening it for a bit until the paint got scratched enough for it to fully get in there.

The instructions don't really mention any of that.

Posted : 23/09/2023 7:13 pm
TJH
 TJH
(@tjh)
Trusted Member
Topic starter answered:
RE: Extruder cable holder rubbing against back belts

Thanks! I had the same issue. I filed a bit of plastic off and re-installed. I think the plastic piece should be re-designed with a bit so it fits into the extrusion more easily (and maybe make it a little shorter), but I now have a clear 1/8" of space.

Posted : 25/09/2023 2:18 pm
Denjo
(@denjo)
Active Member
RE: Extruder cable holder rubbing against back belts

Like jF wrote, this is with 99.99% certainty a mounting problem. This is not engineered well and will catch so many people who are assembling the printer. 

The problem is, that it's also very hard to check if the mount went in all the way. Because of all of this are shiny black parts, and the geometry is covering the sight to the aluminium profile.

You should get around 2.5 mm clearance if it's mounted correctly.

 

Posted : 26/09/2023 1:16 pm
jF
 jF
(@jf-2)
Trusted Member
RE: Extruder cable holder rubbing against back belts

More people with the same issue and two that confirm shaking the dock back and forth while you slowly tighten it solve the issue.

https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-hardware-firmware-and-software-help/dock-fixing-bolt-becoming-loose/#post-676528

They need to fix those assembly instructions.

Posted : 29/09/2023 12:24 am
nhand42 liked
Little Mike
(@little-mike)
Active Member
RE: Extruder cable holder rubbing against back belts

How have folks been resolving this issue? I have spent the past 3 hours fighting with getting the protrusion into the channel on the aluminum extrusion with no luck. Either it sits parallel but not all the way in and when I tighten the bolt down, they still rub against the belts, or I can get the top portion in, but then the dock is pitched forward a bit (you can see both rear bolts will be above the belts like that).

Posted : 18/12/2023 8:26 pm
jF
 jF
(@jf-2)
Trusted Member
RE: Extruder cable holder rubbing against back belts

You pitch it back and forth while tightening it slowly with the other hand and it should slowly settle in correctly, I assume it scratches the paint. At least that was my experience with the exact issue you are describing.

Posted : 20/12/2023 5:42 am
Little Mike
(@little-mike)
Active Member
RE: Extruder cable holder rubbing against back belts

 

Posted by: @jf-2

You pitch it back and forth while tightening it slowly with the other hand and it should slowly settle in correctly, I assume it scratches the paint. At least that was my experience with the exact issue you are describing.

Four hours of attempting that and still can't get it right. I did take the honeycomb grill off for more room to work and the metal front of the dock off and just tried with that. I cranked it down so hard that when I unscrewed it, it was actually pressed into the aluminum but the nub was still not in there.

Posted : 20/12/2023 1:26 pm
BaconFase
(@baconfase)
Reputable Member
RE: Extruder cable holder rubbing against back belts

the dock is pitched forward a bit (you can see both rear bolts will be above the belts like that).

Is this not how it is supposed to be? All of my docks show 2 bolts and they line up perfectly with the honeycomb.

My XL came with 2 docks with a bevel on the top and bottom corners of the interface and 3 docks with a squared off interface like in jF's drawing. So there's some secret revisions floating around I guess. A slight forwards/downward cant would pivot the harness-arm away from the belts which seems better than the opposite. The docking pins calibration steps should account for small misalignments.

 

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Posted : 20/12/2023 8:49 pm
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