@thehawk … well, not sure how you are working out your math, but printed terrain is a heck of a lot cheaper for me.
Cost of printing my own 28mm sized house? Just under $5 USD with the roof and floors. That is the filament, but not the printer.
Price of printing out a dozen dungeon tiles, to make up one room? Again, under $5 USD for the filament.
If I assume that my $300 USD printer will last long enough to print 300 such objects worth of stuff, then the cost per house (or room) will go up by $1 USD if I want to include the cost of the printer. Of course, ift he printer lasts even longer, then the cost per building or room will drop.
I don't think you can purchase a house of that size for less than double that. And probably closer to four times that.
Example #1:
Warlord Games offers up this African/Arabic home:
link
This is a plastic house, selling for $25. USD
Or this one, slightly larger with a dome, for $32 USD:
link
These are both plastic kits of buildings sized for 28mm gaming.
Compare them both to this set of African/Arabic homes:
You could print one of each of the three buildings shown, and you would still average about $5 USD each. Or $6 USD each if you tack on $1 USD per building for the shared cost of the printer.
For the price of the one domed structure, I could have 5 buildings, a well, and some walls to go around the village.
And even if half the stuff I print fails right at the tail end, thus wasting filament (and for the sake of argument lets say the structure is totally lost and cannot be salvaged even as a ruin), then that would double my cost to about $12 USD per building. Still under half what Warlord charges for one plastic building.
Will the printed terrain look "as" sharp as the factory injection-molded stuff? No. But it will come close, and once painted up, it will look lovely on the table.
Just my own experience speaking.