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XY Belt Improperly Installed  

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kjones.uwp
(@kjones-uwp)
Member
XY Belt Improperly Installed

Good Day All,

During the initial self test after assembling my recently purchased CoreOne+, I came to the realization that I misguided the XY belts through pulleys and will need to remove and reguide/reroute them before continuing with starting up the unit.  I have been unable to find a belt replacement guide as I doubt they need replacing often once properly installed.

I would greatly appreciate if someone can help give me a brief disassembly and belt reguiding process.  I'm thinking the plan of attack would be through the extruder assembly.

Thank you.

Posted : 03/06/2026 4:52 pm
k1mu
 k1mu
(@k1mu)
Estimable Member
RE: XY Belt Improperly Installed

This article in the Prusa Knowledge base explains how to remove the nextruder, which will then free up the belts so you can re-route them.

Posted : 08/06/2026 5:40 pm
gooner
(@gooner)
Eminent Member
RE: XY Belt Improperly Installed

Hyiger another user posted this, a lot easier.

I managed to figure it out on my own (this is what I remember):

disconnect the nextruder cables going into the love board
remove the heat block assembly
remove the heatsink fan
unscrew and remove the fan shroud and blower
remove the 3 screws holding the heatsink onto the belt carriage
remove the PTFE tube from the coupler
while holding the nextruder, unscrew the PTFE coupler.
pull away the nextruder
release both left and right belt tension pulleys
remove screws holding the belt carriage onto the linear rail
adjust the belts so each left and right have the same number of teeth sticking out

Posted : 09/06/2026 12:54 pm
kjones.uwp
(@kjones-uwp)
Member
Topic starter answered:
RE: XY Belt Improperly Installed

Thanks, in my situation, I made more than one mistake when installing the pulleys/belts so I had to remove the nextruder assembly, correct the mounting issues, reroute the belts and then reassemble.  This issue has now been resolved however I must have made an additional mistake in assembly/reassembly and now I am failing the nozzle heater testing immediately.  It looks like there are a number of threads/guides on this topic.  I'll be reviewing the board connections and cables to see where the issue lies.  Thanks again, appreciate the help.

Posted : 11/06/2026 4:11 pm
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