You're right 3, this has nothing to do with Cura (moderator: can we move this topic to the correct forum? sorry). But I think it's due to material shrinkage not belt tension.
Here is the latest output (in Cura 12.08, not that it matters) with nozzle 0.3 to give more flow and solidity. Also now have 10mm wall vs. 0.8mm yesterday. Here is the key in my opinion: the material is nylon:
Nylon = shrinkage. Solid nylon = extra shrinkage. The interior rectangle "part" shrinks away from the round outside part on cooling causing these (now more dramatic) gaps.
OK, if that is the problem, what might be the solution? I'm using a non-heated garolite platform which I realize isn't helping. Printing at 250C and 50mm/sec speed..but maybe a higher temp or lower speed would help?
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Dim3nsioneer 558
Do you see the gap in the layer preview of Cura?
If not, then it's rather a backlash problem on the printer itself and you should check belts and pulleys.
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