Magnetic pen holder

Basic remix of the very good design from Oscarko.

What I did:
- keep untouched the whole pen holding design which is excellent
- remove the side brackets from the main body
- extend the back side of the body and add a hole for a 10x5 magnet

With the new shape it is easy to concatenate multiple holders side by side. Here attached the STL files for 1, 2 and 3 pens.

With the magnets I had available (10mm diameter, 5mm thickness) the hole is fitting perfectly. I had to push the magnets in place with some force but no need to glue them.