Corner hanging spool holder

This spool holder was designed to mount a spool at the corner of a closet shelf where printer stands. It was optimized to take minimal place, but to be easily dismountable to replace a spool.
In addition to printed 2 axle holders, 2 spools, latch and (optional) filament guide hook, you also need following metal parts:
6x M10 17mm hexnuts,
1 M10 flat washer
285mm (or longer) of M10 stud bolt
10mm metal bore.