I’ve had an Ender 3 v2 for a few years now and have had mostly no issues. I’ve upgraded the hot end to a microswiss direct drive and a dual z setup (twin z steppers on a shared cable).

Recently started having issues with the 4.2.2 board and replaced it with a BTT mini SKR 3 v3.

Since I’ve put the new board in, I am having troubles getting the bed to level and stay level.

The height profile of the bed is now showing a dip in the centre (which was not there before). When I run a print it seems to be overcompensating for the dip. If I level the bed with the corner screws and don’t use the bed mesh then it prints fairly good, but after a few prints the bed goes out of level again.

I can’t seem to make any adjustments that help the issue. Yesterday tightened up all the screws (silicon spacers instead of springs). Releveled the bed and had a small dip in the middle and an overall height difference of 0.170 across the bed (normal prior to this was 0.310). Sent a print with bed mesh and mostly came out good.

Went to fire up a new print today and the bed height is showing 0.830 overall difference.

I’m not sure if it is a BL touch issue (the BL touch is a v3.1 and is original with a single 5 wire connector plugged into mini SKR) dual z issue (disconnected 1 in an attempt to level and didn’t see much difference, the BTT has two connectors for dual z but run off one stepper driver as I understand it, I am using the y cable for only one stepper motor, while the other motor has its own cable).

I use klipper with a RPi zero 2 w.

I just can’t seem to figure out that has been causing the issue since the board swap.

Anyone have some ideas as where to point me?

  • @[email protected]English
    1•1 year ago

    I had an issue like this and it was my bltouch lost it’s accuracy. Try rubbing a repeatability check. PROBE_ACCURACY.

    • @[email protected]OPEnglish
      1•1 year ago

      I did a probe accuracy test yesterday, 0.002. So I think it’s good.

      I have the entire printer torn right back to square one. Will double check everything as I reassemble.

      Did a couple prints yesterday with no BL touch, bed level the four corners, seemed good a bit of first layer micro adjustments.

      Went to perform another print (same as the previous print) and the bed was out of whack again. The bed level test said that the right side was out half a turn on the knobs.

      I’m starting to think it has to do with the dual z motors and not staying timed or level with each other.

      Will see how it works once I get it all back together.

      Thanks.