I designed this case for a clock I made. The clock uses GPS signals to synchronize the time, is daylight savings time aware, uses the system RTC if GPS is unavailable, indicates AM/PM while showing 12-hour time. The clock is powered by an internal LiPo battery, but can also be powered externally via Mini USB, DC 5v adapter, or from a 6v solar panel. While connected to external power the internal battery charges too.
The case is super simple with internal slots for the GPS module, 5v boost module, charging board, Trinket Pro, and 2500 mAh LiPo cell.
After printing I tapped the case and back plate holes for 2.5mm. The display rests against offsets which I drilled and tapped for 2mm after printing. I didn't want to deal with the extra iterations of modeling LCD backpack mounting holes.
More info about the project: https://mikeymakesit.com/projects/GPS-Clock/
Supports are needed for one of the internal shelves. I used higher than normal infill so I'd have more material inside the LCD backpack mounting offsets.