There are so many factors involved that I learned over the past month or two of experimenting with this. Like - time you lose when something breaks. I lost a $200 motherboard on a print a few weeks back. It took time and money to fix it. There's obviously materials too, and losing your equipment for your own use when you are creating orders. Someone would have to be really dedicated and there would have to be a pretty large demand for molds for it to happen correctly, in my opinion. If it was easy and a big demand there would already be custom new molds everywhere. The demand is a big thing - I think it says something when only 2 places online will even sell leaf, and those choices are pretty limited compared to the commercial cigar choice at that. If the demand was higher, we'd have an Amazon for leaf sourcing with every type imaginable. I could probably fill everyone on this thread with molds in a few weeks or a month. Then where is the demand?
To print something commercially this size it starts at $60, or more, for 2 sticks. A roll of plastic is about $20-$30. The number of molds you can get out of that roll are limited, and only come down when prints have to be restarted and thrown away. The economics don't really add up to produce more than one offs for the $50-$75 range unless you cut down on materials and time. If you buy a brick of ABS and CNC it, you are buying more plastic than you need and removing waste, which would likely make the materials cost more. 3D printing adds material instead of removing it.
The time I put into design is not much at all compared to the monkey work I put into making the machinery behave. I can design a work of art bunch mold in no time flat. I could make you a box press mold... or a square mold even. On the other hand, it takes at least a day to create the physical object if nothing messes up with the printer or CNC. I think I have it down to about 12 hours for a 4 stick mold, 24 continuous hours for 6-8 stick molds. Rarely does it go perfectly. Lol. I just found a whole roll of plastic that would refuse to print. Since I like being frugal, I tried really hard. Then I realized I lost a bunch of hours trying to save a $25 roll of plastic. Tons of stuff to consider with this thread. Producing 10 molds, that people would probably never reorder because (hopefully) your molds are good, dictates prices should be higher or it's not worth it to the seller to mass produce these things for the home rolling crowd. I imagine the commercial industry requires much more industrial strength molds.
But I only print these things as a hobby and for fun. I happen to have the equipment because I have other hobbies that use them too. So I'm lucky. If you went from the ground up you'd be putting down thousands of dollars in expenses (1-2k for a somewhat decent printer, but probably more and at least 1-2k for CNC equipment) Most of my machinery is cobbled together like Frankenstein from DIY upgrades I've made over the years (and part of the reason my CNC isn't fully functional right now). I haven't given this much more serious thought about the logistics then what I wrote above because all those factors started outweighing the fun of it all.