A cheap frame is used ( see below ) to make a nice clean rack mount for Raspberry Pi's. Easy to print
Use 2-4 M2 screws to fix it.
The frame for the rack used is: https://www.musicstore.com/fr_BE/EUR/DAP-2-HE-Rackblende-f-Modulsystem-10-Segmente-MP-1/art-PAH0017160-000
The author remixed this model.
Print orientation optimized for cleaner look