Source
r/FLSUNDelta•
flyingfox

Preventing score lines on flat surfaces

I've been trying to print a simple sign and can't seem to get rid of diagonal score lines on the upper flat surfaces. Example: https://imgur.com/a/IJSnr2W

The lines com in all directions. I'm printing on a FLsun SR using Cura 4.11.0-BETA with 8 top layers. I've tried all of the following to no avail:

  • Speed changes down to 60 mm/s
  • Print temperature
  • Ironing on/off
  • Infill patern and density
  • Z Hop (1, 1.5, 2mm)
  • Combing on/off

Any ideas what could be causing this? I'm planning to hit this with some primer and paint but would like to start with as smooth of a surface as possible.

Posted Oct 20, 2021, 3:52 AM UTC

12
neildarlow•

It looks like you could be slightly over-extruding. Have you measured the actual diameter of your filament and put that into your slicer settings?

Over-extrusion on top solid-filled areas results in a higher than required layer which your nozzle will plough through on travel moves.

1
flyingfoxOP•

Think I finally solved it. I re-leveled the bed, printed endless calibration structures, changed filaments, changed speeds, calibrated my extrusion, dialed the extrusion back anyway. Nothing seemed to help.

It was getting worse and worse to the point that the print head would sometimes strike the model (usually the infill) and leave bits of plastic scattered around the table.

Then I wondered if all the prints I'd done at higher speeds with gyroid infill that chake the whole room had loosed up the drive belt tension. Sure enough, a little tension on the belts and it's printing like new again.

1