400 µm isotropic clearance is perfect for ToughPLA on ToughPLA, where both the male and the female parts will shrink a bit. In the case depicted above, a metal male part pairs with a female ToughPLA scaffold. I am currently trying 300 µm isotropic, but for a flush fit I suspect that the minimal vertical clearance is going to be smaller than the horizontal one.
Best way to get better clearance is to dial in your flow rate and speed more, but you have to keep in mind you dealing with plastic that shrinks when cools and each type/brand might shrink more than another. But i do find personally myself that 0.4-0.5 is the normal clearance needed for pla.
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