To me it looks like there might be multiple issues?
I have the impression that the bed is too high, and thus the first layer is not squeezed into the glass enough and does not bond well?
Maybe your bonding method also needs adjusting? For example if you use the glue stick, wipe it with a wet tissue after applying, to get a very thin layer? Or clean the glass and apply the bonding more often?
And then of course there is underextrusion at irregular intervals, which could have lots of causes: partially blocked nozzle, too high printing speed, too low temperature, spool near the end and wound too tightly (this acts as a spring that resists unwinding), deformed teflon coupler, wrong feeder pressure, dirty feeder, wrong filament diameter, dirt in the bowden tube, or other things along this line...? But I am not familiar with the UM2+, so difficult for me to say, it is a bit of guessing.
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cekuhnen 1
After this crap print
I calibrated the print bed again with the build in function and then with some test prints to check corners.
I had one 98% good print that showed only at two layers issues - which however is already not good
and all following prints are horrible again. Below are two print attempts of the same mode ...
@gr5 I am not sure if you could maybe point me towards a solution.
Can the PLA be old or the print glass surface have issues?
Edited by cekuhnenLink to post
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