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I think its an over extrusion problem. maybe 5-10 degrees more nozzle temperature and extrusion 0.9-1 will help.
test with this:
https://www.thingiverse.com/thing:2759012
Use printer preview with simplify 3d. Gaps may result from bad extrusion with./ nozzle diameter. you cant always print waterproof surfaces...

Tigerboy: Level/extrusion tester or reel for magnet wire and strings