Hardware Is Hard – The Journey of the AirGradient DIY Kit Production

>When we received the first samples with the CNC cutout for the display enclosure, we noticed that it was a few millimeters off which caused a tiny gap between the display and the enclosure.

a few millimeters off may cause a huge gap, given the overall dimension of the enclosures, maybe it was a few tenths of millimeters.

I can feel the pains you went through, though it seems like the typical hiccups that may happen on any manufacturing process, apart the COVID related issues, I have seen same or very similar delays/problems in any non trivial project, where diferent manufacturers/suppliers are involved.