A simple hook designed to hang filament samples from the front 27 mm rod of my filament shelf.

The idea is straightforward:

• Hang a printed sample directly on the rod

• Easily grab samples for color comparison / color choices

• Clearly see which filaments have samples printed

• Quickly know where each spool belongs

If a spool has a sample hanging, it has been used before.
If there is no sample, it is new.

I use @Neohhhh's Simple Filament Sample but you can of course hang whatever type of sample you prefer. :)

Update - bundled sample model 

@Neohhhh kindly approved including their Simple Filament Sample in the 3MF. You can now print both the hook and the sample together in one convenient plate layout.