Prusaslicer 2.2.0 Combine Infill Every 3 Layers

Mostly Printed CNC - MPCNC Advice
1

Has anyone tried the Prusaslicer 2.2.0 option to “Combine Infill Every” X Layers?

I’m running a 0.6 Nozzle, Layer height=0.16, Perimeters=3, Gyroid, Fill Density=45% and Combine Infill Every=3 layers.

Seems to be working well. Getting good outside perimeter details with less time spent on infill.

  0.6 nozzle x 80% = .48 max layer height
  0.16 layer height x 3 = .48 infill

Will be following Ryan’s recommendations for Core but hope to still use the Combine Infill option.

Thoughts?

2

I’ve used combine infill on Simplify3d, when using 0.15 layer height I combine x2 to get 0.3. At low infill percentage and low layer heights, sometimes I don’t get infill, I get particles of crap in the interior. Thicker infill helps and the time saving is a bonus.

For a regular 0.4 mm nozzle 0.48 would not be advisable but for your large nozzle it should be fine. I don’t see any reason this wouldn’t work for printing MPCNC parts.

3

I can confirm missing all the thin infill layers in this case (only the combined layers being tried, some of them succeding, most of them not -“printing in the air”):

  • 3d honeycomb infill 2%
  • 0.6 nozzle with 0.68 line width
  • line height 0.12
  • combine infill layer at each 3 layer

3x0.12 = 0.36 which is absolutely fine for 0.6 nozzle, but volume was computed for 0.12.
I guess too many factors go against printing low levels infill: low volume, 3d honeycomb and low infill percent. If one of them would be different I guess it would work (haven’t tried successfully so far, as it’s my first attempt).
Thanks