Small spools for different kind of tapes. Can be used on a belt with a strap (https://www.prisma.film/Arno-Strap-Spannriemen-Bannert-18mm-75cm-schwarz).
Each spool type has a 2mm padding on each side so you don't have to touch the tape to hold it, also for better rolling from a belt.
This was mainly designed for film sets, since we often need different colored taped quickly accessible and I did not want to go for a hunt for multiple spools. Probably has other uses as well.
Since the spool does not have a big area touching the printing bed it sometimes does not stick very well. For me it helped adding a not touching but bigger and very close skirt, see picture I added.
The author hasn't provided the model origin yet.