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Edge warping on top of support - is there a way to build a brim on top of support?

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I'm a beginner.

Gear list: Printrbot Play with extended heated bed and glass plate. Cura 15.04.6 on Win10. Standard PLA at 208 C, and the heated bed at 60 C.

This is the STL file:


It's a component for a quadcopter - the motor mount at the end of each arm. I print it with the 3 knobs pointing down, so it needs support. The support settings I used in Cura are:


  • Everywhere (there's a little horizontal hole in one of the knobs that I thought required internal support)
  • Linear (as opposed to grid)
  • default values


For reasons of strength I use shell/top/bottom thickness of 1.6 mm and fill density of 40% (2x the default values there). The other settings are pretty much default for this printer.

The bottom edges on the main plate are curled up (warped):


Is there a way to tell Cura to build a brim on top of support?

What other techniques I could try to avoid warping on top of support?

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