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]
OpenMic Audio recorder I have a few of my ESP32 boards which are battery powered. The charging side itself is not too hard A TP4054 can char...
Have you ever tried printing threads?
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