This is the way. I started 3d modeling by just modifying other people's designs in tinkercad, and then making needful things for myself and the wife. I'm still not anywhere near proficient at fusion, but it's more about getting a little better each time. It's really what FDM printing is best for -- making gadgets that are one-off things that only one person ever really wants, like the wine glass holder I made for my wife to attach to her weaving bench. Super-niche thing, but very cool and she loves it.
Nice. I made her these bobbin things to wind her thread on for storage and she posted it online and people went nuts over them. I gave her the print profile to email to people.
Have her start a Etsy shop and offer to sell them. Probably would be really easy to make some $$ off little simple things like that and some people don't have printers to make their own.
She has something like that but I see what prices people are getting for stuff and it looks like you end up profiting like 6 bucks an hour. I just gave her the print profile and told her to email it to whoever wants it.