This split-flap display sets itself apart by being almost completely 3D-printed. The flaps are printed by changing the color mid-print and mid-layer. The case is also completely 3D-printed.

Video of the display in action (with sound):

https://www.reddit.com/r/3Dprinting/comments/o4boxk/i_designed_my_own_splitflap_display/

It can be used as a date display, clock or anything really. It is connected to the local network with an esp8266.

Josh Murrah made an in-depth video about his build: 

General info about display:

• 10 units (pcb design allows up to 16)
• 45 flaps per unit
• Size: 513 mm x 136 mm x 138 mm

More info in the instruction manual (scroll all the way down to “other files” in the files tab right here on prusaprinters).

GitHub: https://github.com/davidkingsman/split-flap

Partially inspired by https://splitflap.home.blog/