I’ve owned the mini for about a week now. So far I’ve been impressed overall by it.
I have noticed sometimes the board leveling process that the machine does before it prints goes a bit crazy with how far it is pressing down on the corners. “Normally” it will barely tap the corner disc quickly and then bounce back up, then lower slowly again barely touching the corner disc. But sometimes it will press on the disk much harder, when this happens I can see the plate visibly flexing down toward that corner as the nozzle presses into it.
On the extreme end of this issue it pushes hard enough that I hear a loud sound coming out of the machine (sounds like the motor not being able to push any more to me.) But that is rare so far (only twice). The most obvious visual indication that it has pressed too hard tends to be that the first layer gets VERY squished into the build plate, sometimes the print still finishes fine, but others it never gets going because there isn’t enough room for it to extrude the filament.
I say “Normally” above because so far the majority of the time I’ve had no problem. But the times it presses hard have happened enough to worry me a bit.
There doesn’t seem to be any pattern to when this occurs, I’ve had the printer sitting in the same place with no other objects in its way the entire time I’ve had it. I am hesitant to start altering outside variables because it doesn’t seem to be a consistent problem. I’m also very new to the Lulzbot world and don’t really know where to start looking for a cause and/or solution. If there are any other useful details or information I can provide please let me know. I’ve tried to capture a video of the process but haven’t been able to catch it happen clearly yet.
Here is a picture that includes a few pictures I captured of the bed level statistics that get printed to the screen in cura while this process runs.