Pulley position and belt wear
Hi all,
I've had my Core One kit built for a month now and I've been double checking everything because of sporadic major layer shifts and more recently the fan shroud falling off midprint after the screws vibrated themselves loose.
I removed the Nextruder to ensure the belts were attached evenly with the required 4-5 teeth and made sure the gantry was square and the tension within the suggested range using the onboard strobe method. During all this I noticed that there seemed to be significantly more fine black belt "dust" in the back right hand corner; after looking around it seems that the belt is sitting noticeably off center on the toothed motor pulley. I've taken a couple of pictures but without further dismantling it's hard to capture it dead on, I think the amount of visible toothed pulley is clear though.
I looked back over the kit assembly and there was no manual adjustment here, I just used the provided printed tool to act as a spacer while tightening the two grub screws onto the motor shaft so I'm not sure what could have caused this and how I go about correcting it.
Best Answer by Rainer:
As far as I can tell, you’ve fitted the pulley the wrong way round.
Normally, the fixing bolts are at the top on the right-hand side.
In your case, however, they’re at the bottom.
On the left-hand side, by contrast, the fixing is on the underside.
Perhaps you overlooked this when fitting it. It’s clearly stated that the pulleys must be fitted differently.
RE: Pulley position and belt wear
I can't tell enough from the photos except that something seems to be skewed. There should be zero belt dust, belt wear or debris from anything rubbing, so I'd continue disassembly until the cause is found. Definitely don't continue printing. Check screw lengths and that the screws supporting other pulleys are properly supported at both ends. I'm not sure what parts can be installed reversed or "not quite right" but check against the build instructions and come at it as if you've never seen it before. Very curious what you find!
RE: Pulley position and belt wear
As far as I can tell, you’ve fitted the pulley the wrong way round.
Normally, the fixing bolts are at the top on the right-hand side.
In your case, however, they’re at the bottom.
On the left-hand side, by contrast, the fixing is on the underside.
Perhaps you overlooked this when fitting it. It’s clearly stated that the pulleys must be fitted differently.
RE: Pulley position and belt wear
Thanks, you are exactly right!
I have the X axis pulley fitted correctly and the Y pulley inverted. I initially discarded the idea because every other mention of the same mistake resulted in immediate issues and an inability to get beyond initial calibration, I should not have underestimated my capacity to bungle the instructions.
Does anyone have a roughly ordered sequence for the minimal number of steps to get at and flip the Y pulley on the motor shaft, would I need to completely extract the Core XY assembly as per the initial assembly?
RE: Pulley position and belt wear
Hi all,
I've had my Core One kit built for a month now and I've been double checking everything because of sporadic major layer shifts and more recently the fan shroud falling off midprint after the screws vibrated themselves loose.......
So, was it what I thought it would be?
RE: Pulley position and belt wear
You were dead on, thanks!
I tried to reply and ask for tips on getting at the pulley without pulling the whole XY assembly but the forum ate my replies for four days so I blundered on myself and it's all back up and working.
I'm amazed and slightly horrified that it somehow passed all calibration and went though a full spool of PETG with only the odd print shift fail, thankfully the belt seems to only show mild wear from the experience.