Why do my prints get borked on the top layers?
Hi everyone,
I don't know if this is the right forum to ask, if not please feel free to send me to the proper channel.
I have a newly assembled MK4, all self tests pass, generally speaking it seems to be doing its job fairly well - at least with the samples included in the USB dongle.
Today I tried printing the honeycomb wall storage mount from printables, and it came out like this:
It is super weird because most of the layers were absolutely perfect, but the top layers of the middle section got completely ruined - almost as if they burned.
The material is AMZ3d white filament, recommended 180-210° and printed at 205 (first) / 195 (other layers). Default nozzle, default profiles on prusaslicer except for the tweaked temperatures (the defaults in the amz3d profiles are way too high).
I suspect that something weird is happening on the top layers because I have also printed a miniature using prusament (default settings on everything, except for supports) that was perfectly fine, until it started oozing horribly at the top (picture crops on the forum but click on it):
So I don't know if I'm seeing a pattern where there isn't one, but it feels worth asking.
What is compromising my printer's ability to function properly after a centimetre or so? why do the top layers not print as well as the rest?
Thanks!
RE: Why do my prints get borked on the top layers?
So I found the issue, at least for the first print:
Using the default "0.2 SPEED" template, PrusaSlicer for some reasons considers those parts as both surface and infill causing the printer to release the filament twice (or thrice). It is worth noting that using the "0.15 SPEED" template the slice is regular.
There seems to be some bug in the Arachne perimeter generator, as by switching it to "classic" in the template I get the correct slice even on the 0.2 template:
