10" / Mini Rack LED Clock

SummaryA 3D printed 10" rack compatible mount for a Raspberry Pi and cascaded MAX7219 8x8 LED modules to display the current time via NTP.MotivationI fell down a horology rabbit hole over the 2025 Christmas period and ended up setting up two GPS disciplined NTP servers in my home lab. I wanted a way to visualise the time in my mini rack and after some research, discovered there didn't seem to be any commercial mini rack offerings and the commercial 19" rack products were prohibitively expensive (and I didn't have a 19" rack). Hence this 10" mini rack clock.Bill Of Materials1x Raspberry Pi (version/generation shouldn't matter, it has very low compute requirements)1x 4x1 MAX7219 8x8 LED display. Available from Amazon UK here.1x 5-wide jumper wires, included in the Amazon link above.4x M2.5 threaded inserts.4x M2.5 screws.Both 3D printed parts included in this modelHigh Level Operation.The clock is driven by a Raspberry Pi 4 (its what I had laying around) and s