You want someone with a resin printer over a fdm one. You will get waaaay better quality.
For a standard mini I would assume the material cost to be less than £1.
Expect it to be a chunk more than that as it's the cost of the printer/staff/shipping that will make up most of the amount.
This is probably a better question for the 3d printing communities.
Wild Sheep Chase is a great one for introducing people into D&D. A very silly one shot.
It's first combat is quite difficult though and tends to blow out the timings when there are first time players.
Edit: oh, old post.
You can storyboard ideas/set pieces with no idea how to get there. Get them written down somewhere with some extra cool details. I can guarantee now you have that list that you will see a cool option stick one of them in now and then.
your players don't have to defeat every encounter, letting your players lose (without killing them!) can be really fun. It gives them someone to hate, let's you evolve a story and makes your players think more.
embrace chaos! My players love throwing charged dust of dryness capsules at things, definitely makes fights more dynamic!
Disclaimer: I can't run a campaign without an adventure to follow. The above are really helping me go beyond the adventures as written.
Wtf, that's crazy! Why don't they tell you about this kind of stuff in school?