Grab all these files and enter them into the Prusa Slicer (v2.40+) Shape Gallery. Then you can add sizes and labels to your models. All alphanumerics have been generated in Openscad using the Google Montserrat font. Make your own set by downloading the font of your choice.
I added the number '9' on my modified make of t0b1's Stopper for a 2.5 mm knitting needle.
Update - June 6, 2022 - Renamed the special characters that got lost in the zipped file format.
Many thanks to AGriggs191 for catching that one.
The author marked this model as their own original creation.