I designed this thing to find the source of a sort of buldge that occured sometimes.
I printed it 3x with the Slicer PE default settings (0.2mm, PLA), execpt for number of bottom layers=0 and infill = 10%. Orientation see screenshot, fill angle=default/45°.

It prints 8 gr in 30 minutes.

Variable was infill/perimeters overlap

25 % (default): big buldge
-10 %: small buldge
-30 % almost no bulde

We're closing in!