This gadget is often used in EU countries to indicate how long is your car parked in restricted or toll parking area. Using this disc you can leave your car on toll parking lot for short time period without any fee.

I printed those part with 0.4 nozzle, 0.15 layer using multiple colors with M600 command. Printed parts should be easily snapped together via pins, you can secure this connection with glue. Because of high temperatures in car during summer time I highly recommend print those parts with PETG or any other heat resistant material.