blurps or zits or bumps showing on exterior

I'm getting tiny bumps showing up sporadically on this side of print. What is this caused by and how to fix? Material is PLA+, 220°C, 18mm3/s, 0.6 nozzle with 0.3 layer height
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8 Replies
sherbs
sherbs2y ago
Could that be where your layers are starting? 220c seems really hot for PLA... Also seeing some artifacts that look either like belts too tight or input shaping disabled?
gywilo
gywilo2y ago
I lowered the temperature to 205°C and ran input shaper calibration. Looks much better! Thank you! It's really incredible seeing input shaper work first hand!
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miklschmidt
miklschmidt2y ago
@gywilo a good trick is to align your seams or place them on corners. if you're using PrusaSlicer, i often tend to rotate parts 45 degrees, set infill direction to 0 degrees and then align seams to "rear". That places the seams at the far end of the part in a straight line and since it's rotated 45 degrees that's usually a corner.
gywilo
gywilo2y ago
@miklschmidt this is a good trick, will start using, thanks! I aligned, this print like you say; actually still getting some bumps
gywilo
gywilo2y ago
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gywilo
gywilo2y ago
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miklschmidt
miklschmidt2y ago
That thing has no corners, nowhere to hide! But yeah those can be optimized, try "retract on layer change"
gywilo
gywilo2y ago
there's actually no Z/layer change in this area, layer change happens on opposite side of part
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