The opening and the insert both matter
Our Copymaster tray was designed with a 35.20 × 25.20 mm opening. The measured opening was 35.06–35.08 × 25.11 mm. Its lid insert was intended to be 34.60 × 24.60 mm and measured 34.65 × 24.65 mm.
Subtracting the insert from the opening gives about 0.41–0.43 mm clearance along the length and 0.46 mm across the width. That is roughly 0.21–0.23 mm per side when centred, compared with the designed 0.30 mm.
How did it feel?
The lid seated with plenty of play. It was a loose, removable lid, not a close friction fit. The numerical clearance helps explain the assembly, but does not replace trying the parts together.
For this test, free removal is the intended behaviour. A close-fitting lid would need a different design target; it would not be fair to blame the material for clearance deliberately included in the model.
Measure before changing the whole profile
The block measured 20.08 × 20.04 × 10.00 mm, and the bar 40.03 × 9.97 × 4.01 mm. With supported features that close to nominal, a distorted bridge is not a good reason by itself to change global flow or scale.
Check the particular feature, avoid measuring across a seam or damaged edge, and record where the callipers touched. These readings came from one print; instrument accuracy was not independently verified.
The full measurement record includes the successful parts and the unsupported features that struggled.