Levenger introduced A4/A5 paper sizes in 2013:
https://www.fountainpennetwork.com/forum/topic/249272-levenger-circa-now-in-a4a5-sizes-too/
At some point between now and then, they quietly upgraded the paper guides on all of their discbound punches to have stops for A4/A5 papers. However, if (like me) you opt for a used punch to save $$$, you might find that it's a pre-2013 model, and therefore lacks A4/A5 markings on the paper stop.
I made this model to solve that problem. I decided to make this model only have A4/A5 stops, so that the text would be easier to read. If you want the other paper sizes, just use the original paper guide.
I am including the source Fusion 360 files, which contain measurements for all supported paper sizes. Feel free to remix. Multi-filament text might be nice. For readability, I filled the text with speedball (block printing) paint, but some crayon would work too.
Printed with 0.6mm nozzle, 0.20 mm layer height, and ironing enabled.
The author marked this model as their own original creation.