so, kind of new here, i didn't find anyone talking about this (didn't search that hard), didn't know if i should upload this in the main site, but a made an inner tray for my n64 cartridges.
It fit in a single A4, is not sized to fit the UGC, but it is in the same proportions, so if you are starting to organizing yours cartridges, just aplying a scale to the cover will do the job, (i dont know the scale factor yet).
the dxf file is here if you want to make any changes, just share it to.
i don't know why but i can't upload a file here so here is the link
https://drive.google.com/file/d/1r-ThQvzgheMDLOTQhKMb3aQVeO4cOH4EEdit: just find out that the sizes don't match the UGC (at least not the wiggy covers), trying to fix it now