Mesh Bed Levelling not working . . . ?
Hi there,
I wonder if anyone can help with this.
After successfully building a MINI+ (with NO screws left over!!!) and the self test running through flawlessly, I tried a mesh bed level and then a First Layer Calibration (FLC).
So, the head started at the far side of the heatbed way too high and I started lowering the head with the knob - but when the head reached the nearside (next to the Z-axis column) the head was dangerously close to the heatbed. I then watched the FLC and surprisingly, at the nearside the head was at the 'correct' height but at the farside the head was always 4-5mm high. Needless to say, the final small rectangle print was cr*p!!!
I am surprised as I thought that the PINDA sensor is supposed to compensate for heatbed level differences.
Any ideas?
RE: Mesh Bed Levelling not working . . . ?
Hi
Seems you have XY axes squaring pb. There is a similar post there https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/first-print-bed-leveling-failed/
Issue solved following that procedure https://help.prusa3d.com/en/article/xz-axis-skew-correction-mini-mini_158518
My guess is that PINDA cannot compensate such a gap (5mm or more)
To be sure you can contact Prusa tech support by chat from eShop web page
Hope it'll help
JC
Prusa MINI+ at home / Prusa MK3S+ in the Fab Lab / You can have a look at my designs here printables.com
RE: Mesh Bed Levelling not working . . . ?
Hi again
It's not XY but XZ axes squaring
Sorry
JC
Prusa MINI+ at home / Prusa MK3S+ in the Fab Lab / You can have a look at my designs here printables.com
RE: Mesh Bed Levelling not working . . . ?
See this article and pay attention on B. Large correction chapter.
[Mini+] [MK3S+BEAR]
RE: Mesh Bed Levelling not working . . . ?
Thank you jcjames_13009 and BogdanH.
I used the major levelling in the article and it has improved the gap difference. I'm guessing that if I elongate the screw holes in the plastic ends holding the extrusion nearest to the Z axis with a small round file, I'll get more play . . . but that'll be a 'last resort'! 🙂
The FLC is working much better and a test print across the heat-bed showed remarkable accuracy and an obviously working PINDA sensor.
I appreciate your help. Thank you.
Jon
RE: Mesh Bed Levelling not working . . . ?
Hi Jon
Good news
From my “short” experience and what I read about Prusa MINI, I don't think so you need to apply mechanical changes on it to correct issues. Following assembly instructions from Prusa web site and applying procedures from the knowledge db is enough
The 2 or 3 times I faced issue with my printer, pb was coming either from mechanical adjustment (squaring, unsecured screw, …) or modified/non-standard parameters in PrusaSlicer
Have fun
JC
Prusa MINI+ at home / Prusa MK3S+ in the Fab Lab / You can have a look at my designs here printables.com