M8 rod holder for Drybox - with counterpart

Due to the thin plastic box (IKEA Samla 22l), I needed a M8 rod holder with a counterpart, so I added one for [this rod holder](https://www.thingiverse.com/thing:2093033).


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PS: If you are interested in my version of a drybox visit my (german) [blog](https://quackerlatuet.wordpress.com/2018/03/01/drybox-die-trockene-lagerung-und-halterung-fuers-filament/).