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Thin gap between outer wall and inner wall, only on small circular insets but not on the perimeter of the print...

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Firstly, I love Cura, been using it for a year, it keeps getting better and better! Thanks :)

I've been going crazy over this issue for months now, I've posted asking for help on r/3dprinting and the wanhao duplicator i3 google group and nothing I've tried works, or at least what does work messes something else up.

I've built some game hex pieces that have circular insets built around the perimeter to allow for tiny magnets. Every other detail of the print comes out great but these particular insets keep printing with this gap between the inner and outer walls.


What baffles me is if I print the same size inset into a small piece of plastic like a tiny game piece they come out perfectly fine. These gaps appear all the way around the outer wall on each inset, sometimes slightly touching the inner walls but mostly there is a visible gap. Here is a blender mockup I built to visualize the problem better.


The STL looks fine in Cura, here are screenshots of the STL and viewed in Layer Mode.



I've tried many many things...

...adding an infill and skin overlap of .2 then .4mm

...playing with my retraction settings (I thought maybe as the printer retracted to travel from one inset to the next it was under extruding when it got to there.)

...I tried to give Compensate Wall overlap a negative value to increase overlap between inner and outer wall but the software is currently just a check box.

...I've got Fill Gaps Between Walls set to Everywhere.

...I slowed my Outer Wall print speed down to 10mm/s

The only thing that fixed the matter ruined every other bit of my print, by editing the Outer Wall Inset by about .2mm the outer wall overlapped the inner wall and printed with no gap. But not only does this throw off all of my tolerances which I had to recalculate it also makes for poorly printed small details, so I had to abandon that "fix".

The models are built in Fusion 360.

I'm printing on a Monoprice Maker Select V2.1

That's a .4mm nozzle.

I've tried multiple different brands of PLA, printing from 195-205f.

The insets have a diameter of 3.325mm, I'm wondering if this is causing a problem with the nozzle width, but even that doesn't make sense to me, again, these holes print out just fine one at a time.

Anybody out there that can shine some light on why I'm having so much trouble here? I think my hair is graying over this nonsense :/

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