Ironing Calibration Test Flowrate Line spacing

Spoiler: there are no perfect values for flow, ironing, pressure advance, retraction etc. that work for everyone.
There are good values that work better than others, but if you’re chasing perfection you’ll have to find your own.

I released a version for BambuStudio and one for OrcaSlicer.
 

This is the manual ironing test I use, and I’ll briefly explain how to set it up.

Preparation

• Start by setting the correct filament flow ( I use Manual YOLO Test Calibration )
   

  

   

• Set a proper Pressure Advance and filament temperature for the material you want to calibrate.
• Enable Z-hop in the filament settings.
• Configure the process as shown in the image below:
  • customize ironing speed and ironing pattern (use the same speed and pattern you plan to use in the final print).

Note: Ironing flow and line spacing are incrementally changed for each object.
 

Checking the test

• Verify that the process modifier is applied correctly by checking in Flow preview mode.
   

  

• The last (yellow) line uses 0% ironing flow, so it only shows travel moves (no extrusion).
• If you want to skip some values to save material, just uncheck Printable on the objects you don’t want to print.
  
  
  

• Look for the surface that appears the most mirror-like.

   

  

   

• If you notice defects along the edges, it’s probably due to an incorrectly tuned Pressure Advance (too low if you see over-extrusion).

Remember

Both the Flow Rate and the Pressure Advance values can affect the Ironing results, even with the same other parameters.