Right Motor idler assembly
Hello! I have taken the right motor assembly apart twice now because the bottom belt in the corner keeps riding up over the idler. I triple checked the stack up and it is correct. The second set of pulleys you can actually see on the front side seems to be totally fine and unaffected. Anyone seen this before and know a fix?
13 Replies
Its almost like that idler is sitting a smidge too low
nope they are exactly the same spacing. I cant for the life of me figure out why this belt is rolling up over the idler
and you cant see inside once its assembled
yea I cant for the life of me figure this out
So I put another 1mm spacer on that idler and it seems to have fixed the issue? not sure why my build would be different than what the manual says....
After a quick search on the discord this seems to be an issue others have struggled with as well. hoping one of them sees this and can suggest something
It could be a crooked frame
So I swapped my top and bottom belts and made some adjustments and I think its better. But you can see on the photos below that the left side comes out nice and then it looks like its lower on the right.
Thought I might have gotten a little bit of help here.
as you move your carriage by hand, watch that back area (as photo'ed) and see id that belts are moving up down as you reverse direction. The top and bottom motor plates being skewed, will tilt the pulleys causing this type of movement.
As you view the belt going around the motor pulley (through the little oval window,) watch to see if the belt remains centered on the pulley. you should see just a tiny bit of space between flange and belt above and below on the pulley. If it's changing the pulleys are simply not parallel and level with each other
the belt on the pulley in the left photo rides up and down. other one seems fine. what do you think would cause one side to do it but not the other?
I have triple checked the stacks to make sure they are right
is it possible a shim needs to be moved? I feel like I did a really good job of squaring the machine as I built it
If the belt is riding up and down, two pulleys are not in line with each other. -or- one pulley is tilted. there is no other reason for the belts to not run true, save one every badly damaged belt where 1/2 the belt length wise is badly stretched (top/bottom) along it's length (doubtfull...you probably would be able to visually see that damage)
So when I was having this issue yesterday I swapped the top and bottom belts and the problem moved to the other position
which made me wonder if it was actually the belts causing the problem
I have gates belts on order just in case that was determined to be the issue
hmmmm.... if you took that suspected 'defective' belt.... and swapped it end for end.... wondering..but it would seem the motion direction should make that belt ride up down in the opposite direction (swapping top/bottom stretch)
yea without knowing where to look im not sure how to tell where the root cause is. if my frame was skewed I would imagine both belts would want to jump the idlers
and you cant take off the top of the mounts to see what happening so its a crap shoot
and because the problem followed the belt I assume its the belt thats the problem. I'm moving to FMMM in a few weeks so I'll just wait to do both at the same time and see if it solves my issue. fingers crossed
luckily I have two other printers
@ptegler thanks for taking the time to answer me.
did one belt move or both belts?
Yup that’s what I would expect also. That’s part of the reason why I think I got bad belts
Did you evaluate if the frame could be crooked?
I measured and my frame is square within 1.5mm