Update 24/08/23
I have updated both the main Arduino program (MC1) and the Interactive Calibration program.
I noticed that, occasionally, the cams seemed to "lose" their position and a power on reset was needed. I eventually traced this down to the Servo library (still no idea what exactly happened but it was 100% due to the library).
So I we-wrote the routines to drive the servos eliminating completely the servo library.
As a happy benefit the clock movement is now MUCH quieter.

Shiura's mechanical digital clock was an awesome project.
My remix does a few changes to some of the 3D printed parts but a lot of work on the electronics (my field) and the arduino software.

Changes:

• Removed the holes from the top of the digit frames for a cleaner look
• Complete makeover of the clock base to house my electronics and give digit separator colon
• Remix of the cover boxes to have mounting holes and fit better
• Remix of the digit retainer for a cleaner look
• Remix of the cam to give a more standard '7' character
• Design of a custom PCB for the electronics complete with UK MSF atomic time receiver
• New Arduino programs for both run time and to easily calibrate the servo positions

Creality

Ender-3 v2

No

No

0.2

25%

The base only JUST fits on an Ender 3 V2 when orientated on it's back and at 45 degrees.
This needs supports (I used Tree supports).
As in the original the Cam needs supports.
I printed the segments with the faces down with white as the first 4 layers and then changed to black. In this orientation the segments need supports also.