Original model (and the hardest part of the design job) by Ame (https://www.printables.com/model/1321813-padel-tennis-score-watch)

I've adapted it to make use of an elastic band together with the band locks.

Print instructions:

• Case & Band lock without supports
• Spring also without supports but PETG might be a more durable solution here
• Wheels, in separate print, supports needed, filament switch on layer 21 of 23 with 0.2 layer height

Wristband:

• For maximum comfort, use an elastic band (used in clothing like pants) together with the band locks.
• Another great solution is to use a double sided velcro band.

Assembly:

• Put the wheels in the case
• Put the spring as shown in the picture
• Close the case and screw together with some tiny screws
• Put the band trough the case, then trough the band lock, then back trough the case. Adjust to size.