Irregular adhesion when printing a frame for a cat flap on brand new PRUSA MK3S+  

RE: Irregular adhesion when printing a frame for a cat flap on brand new PRUSA MK3S+

Well the first question is are you using 3x3 mesh points or 7x7 ?   - 7x7 gives a more detailed mesh map for the bed adjustment to use
Second one would be how exactly did you 'clean' your bed to make it perfectly clean. - IPA doesnt really remove all the grease, it sort of spreads it around in a thinner layer
Third would be did you touch the surface at all after cleaning. - finger prints are the bane of pla adhesion on the smooth sheet.  

Then would be all the usual questions of is your first layer live z dialled in well etc etc etc. 
With a part that size that is almost whole bed then it is also advisable to preheat the bed and let the heat equalise for 10 or so minutes before printing.  The heating elements/tracks go quite far out but don't go to the edge so it needs time to warm through.  

Also your listed settings, are you sure you haven't introduced a typo or 2 ?  As for PLA filament 75 on the bed is on the over hot side  (50-60 is more common) and the printing temp of 115 is about 100 degrees too low, those are generally 200-210 ish.

RE:

Thank you very much for the answer. I actually had mesh only on 3x3, I will now try with 7x7. I actually had the extruder temperature set to 215 °C (115 °C was a typo). I will now try it with 200 or 210 °C.For the print bed temperature, I had 75 °C for white PLA (worked better), 60 °C for black PLA. worked fine.

I will pay even better attention when cleaning the print bed. I will report when a new test is printed.

Best thanks 🙂

Agreed, those blemishes look like fingerprints.

Cheerio,