I made an absolute position encoder and entered it in the "#Made with math" contest and people asked me what practical advantages it had. So, this is the clock I made with that.

https://www.instructables.com/Absolute-Position-Encoder-With-Single-Track-Gray-C/

I used some recycled beer and soda cans and plastic.

Main parts: a custom pcb, arduino mini, motor controller modules, RTC clock module, some gears and bearings, a piece of copper wire, shafts, 2 dc motors.

https://oshwlab.com/holybaf/project01

Cut the plastic into small pieces and melt them. I don't have 3d printer I used this method instead. I made 2 discs for supporting the hands and made a fixture and counterweight from melted plastic.

An Arduino mini controls the 2 motor controllers and processes data from 16 opto sensors to calculate hands positions.

Arduino Mini

2 DC motor driver modules.

DS3231 RTC module

0.91 Inch OLED Module

The main gears are: Main Drive Gear 150T for TREX 450 SE V2 V3 PRO Helicopter,

F6700-2Z Flanged Deep Groove Ball Bearings.

2MM x 60MM Toy Model Iron Shaft

A piece of 1.3mm diameter copper wire.

3V DC motor.