The holes are 1.5mm diameter.
Some high resolution images...
[printed using ColorFabb nGen on a Lulzbot TAZ 6 with 0.5mm hot end at 200µm layers]
I decided to make a scalable LED panel, so a grid of LEDs, all full RGB (WS2812). I can manage this at 2x2mm, using 1x1mm LEDs, but no space...
Have you ever tried printing threads?
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