Mesh Bed Levelling: What amount of variance is acceptable?
Hi All! I am having first layer issues so I have been using OctoPrint's Mesh Bed Level Visualizer plugin to measure the MBL variance. I ma following the guides from Prusa but I am still finding it hard to get a good first layer across the entire bed.
Below is my mesh data. Given the scales are supposed to be exaggerated this looks fairly good to me. In reality, a 0.512 mm variance would seem large compared to my typical layer height for printing (0.2 mm).
Is this an acceptable variance the printer can effectively compensate for with auto bed levelling? I'd like to know if I am anywhere in the ball park before going deeper (taking the printer apart to look for faults).
-0.250 -0.121 -0.367 -0.312 -0.304 -0.285 -0.070 -0.129 -0.187 -0.186 -0.172 -0.159 -0.265 -0.136 -0.007 -0.060 -0.041 -0.022 -0.002 -0.022 -0.042 -0.047 +0.049 +0.145 -0.007 -0.094 -0.180 -0.016 -0.005 +0.006 -0.145 -0.165 -0.317 +0.015 -0.059 +0.038
RE:
The flatness looks pretty good.
What bed sheet do you use use, and with what filament?
Can you show the example prints from the bottom and the first layer?
General recommendation for now - use normal dishwasher soap and scrub the plate with a hard surface of the sponge under hot water to the point the water is not dripping with droplets but covers the whole sheet, let it dry and install it back on the printer.
Then run https://www.printables.com/model/107639-first-layer-calibration-prusa-mini - there is a link to the video showing how it works in more details.
See my GitHub and printables.com for some 3d stuff that you may like.