Derwent Electric Eraser Mount
Holder/Clip for the Derwent Electrical Eraser.
The backside is flat, so you can either glue it onto any flat surface directly or provide your own hook/mounting mechanism.
Print with the backside on the bottom. Supports are not needed.
If you use Cura I suggest to enable "Make Overhang Printable". This makes the back of the curved clip a bit neater.