[Solved] Making stickers from scratch

[Rene Rechthaler]

Hello, for the number 6415918u:

if you look some posts up, there is the whole sticker sheet, it has its own part number in the lower right corner: 10101053/6415918

and u is the 21. letter of the alphabet

so this means "Sticker 21 of the Sheet 6415918" because here all parts are numbered like the reallife part (as long it has a number).