The parts are all readily 3D printable, with [Jamie] reporting it took less than 8 meters of filament to produce the geartrain for his build. You can even print the clock face if you don’t want ...

I have seen how well the DS3231 keeps time over a year and it’s really pretty amazing. But with the ESP8266 and even cheaper WiFi chips I can’t even imagine building a clock now without WiFi NTP.

Nescafe creates a limited-edition 3D-printed lid with an alarm clock that can only be switched off by opening the coffee jar.

Based on the innovative rolling ball clock design created by Harley Mayenschein back in the 1970s, this awesome 3D-printed variation is yours to make at home, courtesy of free online instructions.

Hiura’s Casino Clock was more or less built from scratch using custom 3D-printed components including spinning wheels with hinged holders to which standard playing cards are attached.