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PA / EM Oddities

Slight Perimeter Gapping

Some find that after tuning PA and EM, minor perimeter gapping is still present:

Assuming EM is well tuned, this is often caused by a slight flow dropoff at higher print speeds — since most people print their perimeters faster than their top layer.

See 📄here for more information on flow dropoff.

There are a few different things you can do:
(in order of my preference)

  1. Use a hotend and/or nozzle (Bondtech CHT) with a higher flow ceiling.
    • This simply causes the flow dropoff to not start until a higher flow rate.
    • This can reduce the effect, but may not 100% fix it.
  2. If your filament can handle it, increase hotend temperatures a bit. This also just helps with flow rates.
  3. Increase your EM until the gaps dissappear. Then, lower your top layer flow (fill_top_flow_ratio in SS) until your top surfaces look perfect again.
  4. Follow my 📄"determining maximum volumetric flow rate" instructions, and choose the "conservative" (always-100mm) value to enter into your slicer (PS/SS).
  5. Slow your perimeters down. The faster you print, the greater this flow dropoff becomes.

Slight Corner Gapping

Having a finely tuned EM also unfortunately means that any cornering imperfections are no longer hidden by overextrusion.

Firstly, try to fine-tune PA to reduce the gaps as much as possible. They may not completely disappear, however. PA simply isn't perfect.

Here's an example.

  • This is the "best" PA line from my test.

  • The circled minor imperfections are the exact same thing that you are seeing in the image above.
    (you may have to click the photo & zoom in)

There are a few different things you can do:
(in order of my preference)

  1. Cover them up using single top perimeters (only available in SuperSlicer).
  2. Slowly increase your EM until the gaps are covered. Then, lower your top layer flow (fill_top_flow_ratio in SS) until your top surfaces look perfect again.
  3. Slow your perimeters down. The faster you print, the more pronounced these PA imperfections become.

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