Underdesk Calender Storage

There are a lot of underdesk book holder out there, but this is mine for use with my Leuchtturm1917 daily planner with a pen loop attached. I also tried to reduce the material usage and retain printability. 

Printed with 0,8mm nozzle on the pusa mini+ and Das Filament Blue Pearl PLA. 0,4mm Layerheight. Print standing on the back, i used a brim to be sure.

It screws in and is then sturdy enough. Its a bit flimsy in the back if not attached, but that is no problem when in use.