Hi,
I have a venerable UM1 from 2012 - one of the first 25 built in-house by Eric and the team and it’s pretty much a stock machine.
But I’m now getting problems with the printhead randomly jumping sideways 2 or 3mm on every print I try. The image below shows what happens as the printhead jerks suddenly to the right. You can see how the infill doesn’t align with the perimeter.
The problem used to happen occasionally but now it’s every print. I’ve cleaned the rails, tightened all the bolts and added machine oil to the metal rails - (no there’s none on the belts). The belts seem fine - but I can’t be sure if they are at the right tension - I’ve never adjusted them.
I not really sure what to do. Is it the belts or perhaps the rails are bent (I can’t see why though).
Any ideas what I should do?