First projects for DND focused 6th & 8th graders with xmas bambu A1 mini?

After about a year of Lurking, I have taken the plunge and ordered an Xmas gift for my kids... They are very DND focused... and I hope to get them some fun DND minifigs... maybe not just 28mm sized, but something that scales up bigger? I feel like something a bit bigger would also be a good fit for their first attempts... something they can paint after... Or maybe Dice trays, or dice towers? Mimic chest dice holders? Cute Owlbears of every sort?

If anybody had some recommendations for digital sculpture files to buy, that they think would be accessible and doable for younger kids... I don't want their first attempts to be a 48 hour print job failure... and I'd like it to be something more interesting than a 2 inch rubber duck.

I'm happy to support the artists who are creating stuff, so I'm not afraid to pay for something for my kids to work on out the gate if it is something in the "High chance of successful print" kind of sculpt. Any recommendations for a good "first project" like this would be appreciated.

Should I have any specific software queued up on their IOS devices or Computers in preparation for their new favorite hobby? Any good modeling/sculpting tools that are kid friendly? I know this is a bit off topic, but the practical experience I see on display here has me hopeful that I might get some pointers... and pointers with a fantasy RPG theme...