Thick enough to be printed with a 0.6mm nozzle, this is for 8mm arrow shafts. The fit is a little loose, but you can tighten it up by sticking something on the arrow shaft (tape)

Can be printed with zero infill - I printed at 0.3mm.

Arachne turned on in prusaslicer

PETG - roughly 7 grams

Shot with a low power Genesis Compound Bow
Roughly 100 mph

v1.4 is two hole, but still single chamber. This one works best.