This is a beer tap handle that encloses a Raspberry Pi Zero W outfitted with a 104x212 pixel eInk display. There's a cutout in the side to plug a microUSB cable into the Pi to power it, whenever you need to ssh into it to update the display. Pi and display slide in via the top, and the included cap snaps right on. Walls are 4mm thick to (try to) handle the force of the occasional stuck tap. You'll need a 3/8"-16, 1-1/8" long threaded coupler and a 3/8"-16 bolt all available from Home Depot (see pic). Comes in a 2-pack by Everbilt. Ace Hardware sells something similar, but it's a larger diameter. YMMV. And of course, a Pi 0W with a 104x212 pixel e-ink display that I got from Amazon. The case is channelled on the inside to handle the slightly protruding usb port, as well as the connector pins for the display that stick out of the back of the Pi. There's plenty of room if you want to remix this to include a threaded hole to avoid the hardware, but it's certainly stronger with the hardware.
Inland, Priline PLA, PETG
I printed standing up to avoid having to clean out a bunch of supports from inside the cavity.
The bolt feeds into a hole on the inside. The coupling nut threads onto the bolt and pulls into the hole in the bottom.