7 Segment Mechanical Counter, Version 3.0 NO-RUBBER-BAND-MOD

UPDATE 12/2025

As some users reported that the springs become weak after a while, I reinforced them. I didn't test them so far, as my original version still works fine. But I hope, this improves the model and I'm looking forward for your feedback!

Why no rubber bands?

Because rubber bands always become weaker and brittle after a while. Replacing them with springs makes the model more reliable and durable.

You can use all printed parts from the original model. If you want to give the NO-RUBBER-BAND-MOD a try, you can download the parts, print them in a few minutes and install the springs into the original model. So give it a try!

How to assemble

- After installing the D-Segment, install the D-Spring. Do not install the rubber band!

Continue with the installation process as shown in the original video. But also do not install the second rubber band.

- Drop the segment plate with the installed segments and cams into the body.

- Install the spring_A+B and the spring_C as shown in the photo:

- Finish the installation process as shown in the original video.

How to print

It's a fast and easy print with no supports.

2 Walls

15% infill

I highly recommend using PETG, as it is more flexible than PLA or ABS.

Print

2x spring A+B.stl

2x spring C.stl

1x spring_D.stl

or simply use the NO-RUBBER-BAND-MOD.3mf