I have this annoying issue where solid infill on the bottom layers doesn’t print properly. It also affects walls on those layers. It looks like under extrusion to me, but it doesn’t make sense.
- It only affects solid infill bottom layers (I.e. layer 2 and 3 for my regular slicer settings)
- it does not happen on first layer.
- it’s not a clog issue, rinsing and cold-pulling doesn’t fix it. Brand new nozzle + hotend didn’t fix it either
- it’s not a flow capacity issue, it happens even with flow as low as 5mm3/s. I’ve used both Stefan’s weighing method and orcaslocers built-in flow calibration and they agree it tops out around 25mm3/s and slicer is conservatively set to 20mm3/max
- it’s not speed related, it happens regardless of speed, from 10mm/s to the regular 200mm/s
- internal solid infill line width is set to 105%
Is there a slicer setting I messed up? Prints turn out ok, slight indent only on layer 2 and 3 because of this. But this just bugs the hell out of me because it shouldn’t be happening.
artwork@lemmy.world
Maybe check if the Z height is accurate at these layer heights. Take a feeler gauge stack and get true measurements to compare where the machine thinks it is at. It wouldn’t hurt to clean and lubricate the Z screws/bushings.
If that’s all good, try different cooling. It’s possible it’s underextruding because it isn’t handling heating/cooling properly so close to the build plate.
I had this exact same output on a Makergear M2 and never found the root cause, but I either over extruded if aesthetics mattered or left it as is and lived with it. One day it suddenly wasn’t an issue anymore. I have no idea the fix as I did a major maintenance breakdown where I cleaned and lubricated everything that moved, changed filament brands, upgraded the nozzle/cooling, and swapped the build plate from glass to PEI on mic6.