3d printing has come a long way! But while I faff over whether i need to buy a printer or not, I am at the mercy of market forces for pricing. The last quote i got for a high quality print of a 54mm figure was about AU$100 (this was in late 2018). But the kickstarters sometimes have affordable limited release 3d printed minis sub-$100. For example Heresy lab have had at least three successful kickstarters with an option to pledge for 54mm 3d printed miniatures. The quality of the minis is very good, though they are not as easy to work with as resin as the material is more brittle and hard to cut.
A number of sculpts have also been made by fans or ‘backyard’ garages.
There are a few more fan made sculpts that were cast in resin, typically by members of the conclave. For example, someone made a Vostroyan guard head. Does anyone have it? Also i think there are a few variant eldar heads that have been cast up?