Bed Levelling
I've been running two Prusa i3 MK2's for six months now and it was all running reasonably smoothly. They are excellent printers for the price but their only shortfall is the bed. It's not actually physically flat, it is warped.
Now I've conversed with the guys at Prusa Research and they've tried to be helpful telling me that it has auto bed levelling that'll take the bow out of the bed but I've yet to see it. You basically cannot use the full bed in one hit without nursing it through the early stages, manually raising it and lowering it till it balances out but now it's just got worse. I updated the firmware to 3.0.9 and it's messed things up again. Nothing changed, I just updated the firmware and now it doesn't level so well. The final corner (top right) just depresses too far and get a false reading is the problem I think. I'm going to have to go through all the checks again and maybe go back to 3.0.7 that I was on before.
Either way I'd love it if they could take the warping out of the bed via the software, that would be fantastic but fairly impossible. Will post more if I resolve this issue.