I haven't used ABS myself, but I read it can tend to clog the nozzle after some time, because its melting temp is close to its decomposing/burning temp? Have you cleaned the nozzle?
Maybe printing a bit slower and cooler could help?
If you suspect the bearings anyway (I don't know your printer), then try a small test-cube first, so you don't waste too much plastic and time on a complete big model. And see if it is present there too. If not, it's not the bearings probably.
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Super_paulie 14
I'm going to stick my neck out and say it's the Z bearings. Does anyone know of a UK supplier? I'll add weight to the bed to see how I get on with a print this afternoon. Cheers guys!
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