Hi, this is a wallmount for 3D printing filament. You can mount it behind the 3D printer to print directly from the holder.

One of the two mounts is closed on the end, so the metal rod does not get pushed out when the printer is printing.

You can swap the filament by just pusing it out on one hand.

You will need a 15mm wide or 7.5mm diameter metal rod to fit into the holder. It costs around 2 Euros in the local hardware store, so it is really cheap.