Summary

Since I broke the previous version while stretching black tubing I decided to make the tips detachable and sturdier. The main body is printed in black PETG and to remove the shininess of the surface I treated it with some brass brushes. Came out nicely low gloss, just like carbon filled filament.

All tubes seem to be made from the same latex rubber material but with different cross sections. For comparison I've attached a table I found. I hope it's ok to use it.

parts list:
1x pliers
2x tip
2x bolts M4x10 or 12 inner hex
2x nuts M4