Infinity STL links

Decent-looking low-greeble scifi building set:
https://cults3d.com/en/3d-model/architecture/infinity-rack-terrain
(I mostly use card and MDF terrain, I've not printed these yet, they're just in my bookmarks)
Sablebadger does some good modular buildings:
https://www.myminifactory.com/object/3d-print-sci-fi-modular-buildings-set-1-172398
...and some generic scatter:
https://www.myminifactory.com/object/3d-print-sci-fi-scatter-terrain-set-1-192925
(look around these profiles as well, often there's other stuff I just didn't bookmark because it didn't fit my specific needs)
Nearer the upper limit of my threshold for greebles is Topo Solitario's 2Kube:
https://cults3d.com/en/3d-model/game/2kube-modular-buildings-for-miniature-wargamming
Topo Solitario's vehicles also fit well:
https://cults3d.com/en/3d-model/game/chicharra-scifi-hopper-for-28mm-miniature-wargamming-toposolitariocrafts
http://cults3d.com/en/3d-model/game/chickenhawk-utility-dropship
https://cults3d.com/en/3d-model/game/sisyphus-scifi-transport-for-28mm-miniature-wargamming
Speaking of vehicles, I'm not a fan of the little pod car but the other two in this set are decent:
https://cults3d.com/en/3d-model/game/cyberpunk-infinity-cars-pack-i
I like Dragon Rest's scifi interior scatter - I've been trying to coerce locals to play the interiors of buildings recently and I've printed a load of their consoles, chairs, servers, holo-tables etc. to fill out the insides of buildings recently:
https://dragons.rest/products/sci-fi-scatter-headquarters
https://dragons.rest/products/sci-fi-scatter-barracks-items
They also have some exterior elements that fit the Infinity aesthetic decently:
https://dragons.rest/products/sci-fi-scatter-solar-array
https://dragons.rest/products/sci-fi-scatter-comms-tower
https://dragons.rest/products/sci-fi-scatter-oxygen-pump
https://dragons.rest/products/sci-fi-scatter-generator
Other building-interior stuff I have bookmarked:
https://www.myminifactory.com/object/3d-print-sci-fi-scenery-office-furniture-support-free-190714
https://www.myminifactory.com/object/3d-print-sci-fi-scenery-startship-bridge-and-terminals-support-free-190715
https://www.myminifactory.com/object/3d-print-sci-fi-scenery-beds-tables-lockers-support-free-190709
https://www.myminifactory.com/object/3d-print-workshop-furniture-360453
https://www.myminifactory.com/object/3d-print-sci-fi-scenry-furnishings-1-support-free-190171
https://www.myminifactory.com/object/3d-print-sci-fi-scenery-modular-cantina-and-bar-support-free-190164
Some exterior containers and crates:
https://www.thingiverse.com/thing:4711964
https://www.thingiverse.com/thing:4711962
https://www.thingiverse.com/thing:4711958
https://www.myminifactory.com/object/3d-print-crates-and-barrels-sci-fi-370089
There's a lot of greeble packs around that can be good for dressing up existing MDF terrain, e.g.:
https://www.myminifactory.com/object/3d-print-sci-fi-greeble-pack-6-460735
https://www.myminifactory.com/object/3d-print-science-fiction-greeble-four-420646
https://www.myminifactory.com/object/3d-print-science-fiction-greeble-three-set-298566

I'm not a huge fan of a lot of Saucerman Studios buildings, but a lot of people do like their stuff and I like a lot of their add-ons:
https://www.myminifactory.com/object/3d-print-sci-fi-greebles-pack-1-186995
https://www.myminifactory.com/object/3d-print-flatline-city-exterior-wall-accessories-openlock-compatible-186720
https://www.myminifactory.com/object/3d-print-bus-stop-211087
https://www.myminifactory.com/object/3d-print-flatline-city-garbage-disposal-truck-186646
I'm sure I have some more bookmarks, I'll check when I'm done for the day.