Thank you for that nice design! Also had my problems with the size of the connectors printed on a A1 with AMS. In the Bambulab studio it says that the "XY-hole-Compensation" ist not possible together with the multicolour printing. Solve the problem with reducing the X and Y-Size from 4.00 to 3.91 for the connectors.
the wheels are not hard to turn, you probably have the top and bottom pressed together too closely and its restricting the wheels. Also it is designed to be a tight fit so no glue is used, you may need to get a mallet or something to knock the pieces in place
Other Issues:I really like this counter but there were a couple issues.
The connectors were too big and I could not get them to go into both plates. I just shaved the edges a bit to jam in.
The wheel does not have enough space for your fingers to turn the numbers. If the back plate was narrower I think it would solve this.
I hope the design changes a bit because I would use this as my primary counter.