This is the Rybonator license we got when we downloaded the dice

"These dice are free for all to use. They were designed by Okamifabrications in coordination with Rybonator of YouTube.

You are free to sell these dice on Etsy, all that you would like. You are free to really do anything with these dice, so just have fun with them. Thank you for supporting the work that I do on my channel.

If you do use/sell these dice, simply link to my YouTube channel - https://www.youtube.com/c/rybonator
Please also list Okamifabrications as the designer of the dice.

I hope that you have a fantastic day!"

I would take that to mean that they're okay with you using the masters to make moulds & sell the dice.

Of course we can! We can support & print any files you have, please message us to discuss further.

Sadly the Computer Goblin is still learning the software so this is not something we can offer at the moment.

Sadly Royal Mail Standard International doesn't come with a tracking number but you can upgrade your shipping in the options at checkout if you wish to have one. I also get proof of postage on each package.

I would recommend you watch (& rewatch) Rybonators How to Make Master Dice for Molds from 3D printed Dice (https://youtu.be/Z0jN06v7lMM)
He reccomends InhibitX as the photopolymer resin can have adverse effects with most silicone (but not tin cure silicone.)
I have seen some others use a clear gloss spray varnish with good results (https://youtu.be/jmbZO-rDNrM)
but have not used either of the methods myself and am not an expert, just an ooze who consumes too much YouTube.
I would just say to do lots of research, ask questions on forums etc and have fun!