Not a first print issue ovalised holes in z axis  

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Aiden McHaffie
(@aiden-mchaffie)
New Member

I've had my printer ages and had many hours of excellent results. However over the last few prints I have noticed that prints are squashed in the z axis direction. Holes are noticeably ovalised and the z height is squashed. So something has changed. I have looked through the forums and help archives but I can't really get my head around this. I calibrated everything when new obviously but I didn't think I would need to re calibrate again. My first layer is a sexy as... well it is very nice and the x and y are spot on dimensionally. I'm wondering if there is binding in the z axis or if this is a slicer issue. I use f360 to design and prusaslicer. I'm using PETG from a company I have used before and the problem is evident with different colours including reels I have printed successfully with. I have run diagnostics and calibrations, all come back ok. Any ideas before I strip the machine down and start again? 

Thanks in advance

 

Aidenit's not round

This topic was modified 6 months ago by Aiden McHaffie
Posted : 26/12/2020 8:55 am
Baklin
(@baklin)
Reputable Member

Just going by the picture it looks like the right side of the print is lower than the left.

Could your right side z be binding and missing a step? I would do a z calibration and look closely when the X-axis ends hit the top to see if the left hits first.

Maybe one of the bearings is running dry.  When you remove the z-axis tops you can pull out the z-axis rods and have a look at the bearings.

Posted : 26/12/2020 10:48 am
Aiden McHaffie
(@aiden-mchaffie)
New Member

@baklin

Thank you for responding. I took the machine apart, three out of 4 z axis bearings were running very rough and sticking in places. I have ordered Misumi replacements. The rods look ok. The bearings are also not particularly well gripped in the printed housings. I could move them and they were in different positions in the block when I disassembled them. I am going to start again with the z axis and then recalibrate all the axis and the e-steps, make sure everything is as it should be and see where we are

Posted : 26/12/2020 12:21 pm
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