Problem with overhangs more prominent with MK2.5 upgrade?
Hello guys,
I just recently upraded my original Prusa MK2S with the MK2.5 upgrade and ran into various issues.
First I repeatedly had clogs due to heat creep when printing PLA. This was mostly fixed by upgrading the stock E3D heatbreak to a Micro Swiss heatbreak. Now my PLA prints come out great most of the time, but the problem I now have is why I am actually writing this:
SInce the upgrade I have issues with part cooling. To be more specific: the new fan shroud for the part cooling fan appears to be bad at focusing the air at the part rather then the bed or the extruder as I quite literally always get a thermal runaway error for the extruder when running the part cooling fan at 100%.
I tried countering this by PID tuning with the fan on 100% but that didn't help either. As soon as the part cooling fan kicks in at the start of the second layer it just takes a few seconds longer to go into thermal runaway timeout... So I redid the PID tuning without the fan running to reset.
So my only workaround so far was to lower the fan speed and the results were good, but now details overheat and curl. I also am trying out the linear advance feature that came back with firmware 3.2.0 (which my MK2.5 is on right now) but that doesn't help with the deformation of small details. This deformation can mostly be seen on overhangs especially with thinner sections. I hope you can see what I mean from these benchys I attached. From these angles the only visible defect is the arch under the roof, weirdly they're all more pronounced on the left side... btw they were all sliced with the new Slic3r PE 1.39.2
(green - DasFilament PLA, black - Prusa PETG, orange - ESun ABS; yes I have this problem with all these materials so far, it's most pronounced with ABS. I think because of ABS's bad overhang properties)
So if anyone has any ideas how to get the details back without a downgrade I would gladly hear your ideas 🙂
-DerBierBaron