Design a Raspberry Pi 5 case sized to the real board - USB-C power, dual micro-HDMI, Ethernet, USB, microSD, and FPC connectors lined up from OEM mechanical data. Toggle the ports you use, preview live, confirm millimeters on the fit sheet, and download a print-ready STL.
Building around accessories? Configure clearance for an NVMe / M.2 HAT stack or the official active cooler, set vents and GPIO access, then verify the envelope before you print - so you are not reprinting another "almost" case.