Spoolock, spoolholderstop

Especially designed to hold the universal spoolholder (or other of mine spoolholders) http://www.thingiverse.com/thing:127181 on its place, instead of using M8 nuts. No tools required, use it on threaded or on plain 8mm rods.

You can also use it for any other suitable spoolholder or for whatever you want to lock with it on a rod.

For the anti slip inlay use a 10mm piece of 12x2mm rubber or silicone tube, or print it from a flexible material.

Not printed and tested yet!