Trouble with first layer lines curling up at the start with wood PLA
I'm using a MK3S+ and have no issues with regular PLA. I recently wanted to print something with wood PLA and am trying to figure out the correct settings. A temperature tower suggested 190ºC would be the ideal printing temperature. In general printing works fine (except stringing issues), but I always have trouble with the first layer, specifically the beginning of lines.
Some more context:
- switched to a Nozzle X 6mm for this filament
- first layer calibration done and is calibrated well with PLA
- PLA prints still work out great, only wood PLA shows issues
- slicing done with PrusaSlicer
- I tried this first with the smooth steel print bed that came with a printer but just bought a satin powder-coated, so it is brand new
- print bed is cleaned after each print with 99% IPA
My first actual print LOOKS like the first layer calibration is not great:
Since I did a first layer calibration I assumed this was more related not enough flow rate and increased the flow rate by 10%. This seemingly fixed the gaps between lines. What I'm trying to fix now is the gaps/holes where a new layer line starts. For this I cut out a smaller model of the print that only contains the first layer to fiddle around with. When watching the printer it looks like the nozzle curls the start of the line upwards and it does not stick to the bed, but after 1-3mm it sticks and prints as expected.
This issue always happens at the beginning of a line, especially noticeable at these screw holes where two perimeters always start. It is also happening everywhere else a new layer line starts.
Which parameters could I try to tweak here?
RE: Trouble with first layer lines curling up at the start with wood PLA
So after some experimenting it seems the first layer calibration was indeed incorrect (or at least not correct for this filament). Lowering the z offset by an additional -0.075 helped trememdously. The first layer now prints nearly perfect at 100% flow rate, but there are still tiny blobs of filament on top of it causing the nozzle to drag on the second layer. I assume this is filament that oozed out of the nozzle while traveling, but am unsure how to fix it. I'll probably play with temperatures a bit and removing oozed filament when the printing starts manually, since the wipe line at the start and the skirt doesn't seem to be able to catch all of it.