Most flashlight clips/holsters I've seen have the flashlight vertical, which tends to make them dig into one's side when sitting down. This one has the flashlight sit along the belt, which is more streamlined. I use it for my EDC every day, so comfort, security and durability are my three main goals.

It's designed around a Convoy M1 flashlight with a ~25mm diameter body, but anything around that size will do - most 18650 tube lights should fit.

Printed with PETG and 4-5 perimeters, it's very solid and snaps onto the flashlight with a nice positive click.