Roto Skylight Blinds Spacer (Roto Dachfenster Rollladen Abstandshülse)

I realized, my Roto skylight blinds were freewheeling when trying to turn them up. In my case, a hexagonal shaft was sliding back and thus did not touch the gearbox of the blinds anymore. 

It was easily solvable by a hexagonal spacer, which is just put over the hex shaft. Height can be individual, so feel free to scale as needed.

Please remember to print in heat and UV resistant material. I used ASA black for it.