WIBTA for finally refusing to help my friend with his 3D modeling "emergencies" after he started selling my work?
I have been into 3D design and printting for a few years now and it is mostly just a hobby for me though I do take it quite seriously. My friend who I will call Dave recently bought his own setup and at first I was happy to show him the ropes and help him out with things like bed leveling or basic slicer settings. It started out occassionally but over the last few months it has turned into Dave calling me almost every night with some kind of crisis because he promised a client a specific part and he cannot figure out how to fix the geometry. I realy did not mind helping at first because I thought he was just learning but then I found out through a mutual friend that he has been charging people for these "custom designs" that I am basically doing for him for free. When I confronted him about it he did not even deny it and instead he argued that since he is the one doing the marketing and the actual printing he is the one doing the hard work and I am just doing the easy digital part. He even had the nerve to ask me to look at another file this morning because his printer was clogging and he thought it was a mesh issue. I told him that from now on I am not touching any of his files unless he pays me a fifty percent commission on everyting he sells that I have worked on. He got incredibly angry and said that I am being greedy and that I am trying to sabotage his new business venture out of spite. Now our friend group is divided because some people think I should just be a supportive friend while others think he is totally exploiting me. I feel like a jerk for potentially ruining his side hustle but I also feel like a complete doormat for letting him profit off my skills without even a thank you. WIBTA if I just stick to my guns and stop helping him altogether until he agrees to pay up?