I already described my printer in my UM profile. Did these not carry over from the old forums? Anyway, it's a UM2. I'll update the new profile.
When you say "rods sliding in and out", as far as I know it's always done that, by a few mm. Is it not supposed to?
I have to say that I'm wary about those pulleys. ISTM that access to the grub screws is poor, and the grub screw heads look likely to get reamed.
Edited by Guest
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gr5 2,224
That really loud noise happens to many people and has happened to me a few times. When you first hear it you think "Oh No! I broke it!". But the machine is very tough and should be able to do that without damaging anything. However it is possible you jumped a tooth on a long belt. It's also possible the rods are a bit loose and sliding back and forth.
There are many possible reasons for getting non-round circles. First of all is it a UMO or UM2? Please describe what machines you own in your forum profile.
On the UMO it's common to have this problem if long belts are too tight as they cause excessive friction and you get backlash.
To test for rods that are sliding on UM2, print something and put a finger on either end (doesn't matter which end) while it's printing anything. Does the rod slide in and out? If so you can loosen a pulley and push the pulley outwards more to hold the rod from sliding. For alignment you want the belt lined directly above or below the rod. It's easiest to test this by pushing the print head towards the side you care about such that the block is almost to the pulley. The block will position the belt in the perfect spot. Loosen and retighten the pulley if it's not lined up.
There are other things that could be causing this. At least tell us which printer you have. And check for high friction by pushing the head around with power off.
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