This is a simple (re-size) remix of wnnorton's Cart Cable Clip (all credit to them). It's a small band that can be clipped over an existing wire or cable and then written on in thin permanent marker. A way to label wires that is becoming popular. Printed in PLA should stand up to typical electronics board temps, but I wouldn't trust it as being totally safe and would keep it as far away from heat sources as possible. Use at your own risk.

It was simply re-sized (arbitrarily by axis) from the original to come close to an existing commercial product.