Itty bitty, quick printing, low material usage, does the job they're intended for.
Designed to be state of charge caps for your M12 batteries, I printed mine green, so after they're charged i put on the cap and toss them in my packout, that way i know they're fully charged, when i grab a pack i take the cap off so i know its used or dead, either way, i need to recharge that one in the evening...
I also added one with a hole for wall mounting the batteries, they clip in decent, i don't think i'd trust it in a truck or something that moves, but it works fine for a stationary wall. I just use standard flat head wood screws, i think they're #6 or #8.
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