Z-Axis wanders when moving

Hi all,

after printing alot on and of with my VCore3 500 I've run into my first major issue.

When doing the bed tilt my machine often times out. The second Stepper (front left when viewed from behind) is always at aroung 1.12-5 when the 3D Touch probe triggers but the other two are closer to 1.19-23. After checking the mounting for the anti backlash nut block I ran the probe accuracy test on all 3 probing points and saw that my Bed drifts down ever so slightly. Next I noticed that my front left corner (when viewed from behind) is always a little too far from the buildplate and the lines dont stick well. Even when using an adaptive Mesh with 10x10 Point for a print thats about 10by10cm. After that I moddled a quick holder for a dial gauge and ran a test with it moving Z to 10mm, then 1mm and back to 10. Over the course of 10 cycles my Z Axis drifted by 0.05mm. This sound bad when doing alot of z-hops.

My questions now are:

Is this normal Behaviour?
Am I chasing too much acuracy?
If it is a problem, where do I start troubleshooting from here?

Thank you all for reading this wall of text

blacksmithforlife•11/30/23, 8:17 PM

you only did 10 cycles, try doing more. 0.05mm isn't much and could just be the backlash (all screws have backlash)

SemorphimOP•11/30/23, 8:20 PM

I only did 10 cycles with the dial gauge, but in total between z-tilt, bed mesh and other tests I must have done around 50?

All of them showed a drift in Z. I thought the weight of the Bed would eliminate backlash in a vertical System?

SemorphimOP•11/30/23, 8:39 PM

Here are three of my probe_accuracy results

First
probe accuracy results: maximum 1.203437, minimum 1.102500, range 0.100938, average 1.150219, median 1.149219, standard deviation 0.031567

Second
probe accuracy results: maximum 1.116250, minimum 1.014375, range 0.101875, average 1.062187, median 1.064687, standard deviation 0.030768

Third
probe accuracy results: maximum 1.002812, minimum 0.911875, range 0.090938, average 0.958625, median 0.962344, standard deviation 0.028995

blacksmithforlife•11/30/23, 8:40 PM

yeah, but how much is it drifting each time? My point is, is it really increasing each time or is that just a little bit of inaccuracy in the system

blacksmithforlife•11/30/23, 8:58 PM

From those probe Maximums you are drifting 0.2mm, that is a lot after just 3 accuracy tests. there must be some sort of binding going on in your system. Did you grease/oil the leadscrews?

SemorphimOP•11/30/23, 9:01 PM

All three with Ballistol Silicon Oil

SemorphimOP•11/30/23, 9:01 PM

Maybe not good enough...

SemorphimOP•11/30/23, 9:02 PM

Will retry tomorrow morning, its 10pm here... Thank you so much for your help so far ^^

SemorphimOP•11/30/23, 9:42 PM

I couldn't let it be... After reaplying the silicone Oil again I disasembled the coupling at the stepper and found some metal shavings resting on the plastic. I cleaned it and found a problem, The Screw holding the coupling to the leadscrew came loose. after retightening everything and checking the other screws I reran the probe_calibrate

First
probe accuracy results: maximum 1.083766, minimum 1.058141, range 0.025625, average 1.067109, median 1.066266, standard deviation 0.006903

Second
probe accuracy results: maximum 1.060016, minimum 1.042203, range 0.017813, average 1.049078, median 1.047516, standard deviation 0.005581

Third
probe accuracy results: maximum 1.042516, minimum 1.030641, range 0.011875, average 1.036484, median 1.034703, standard deviation 0.004072

Thank you so much for your input that it could be binding, without that I wouldnt have checked if all the screws in the couplings were tight!

SemorphimOP•11/30/23, 9:46 PM

Now the question remains is .02 drift in 10 probes good or just meh

blacksmithforlife•11/30/23, 9:52 PM

that 0.02mm should be fine

Z-Axis wanders when moving

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