Aotrs Shipyards produces modern armour and sci-fi ground forces at 1/144th scale (10 or 12mm) and starships ("fleet scale."). Some fighters are also available at 1/300th scale (6mm). Physical models are available by at Shapeways https://www.shapeways.com/mymodels or in FDM from my printer (via direct contact with me).

Note: The Only-Games store for resin prints has had to be closed down due to the subscription cost; it will be reinstated for short periods if the ko-fi goal is released (https://ko-fi.com/aotrsshipyards), or you can contact me to try and organise a special order. I'm sorry, but this was the best I could do under the circumstances.
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The Aotrs Shipyards Facebook page is here, where releases and other news can be found. Models are supplied without pre-supports at the current time; sorry. I do not have a resin printer (and so cannot even take an educated guess), nor is it feasible at this time to pay for commercial supports, given the size of the catalogue.

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Models come with the standard (hollow) files for printing in resin or SLS (designated with -S or -M), and FDM prints; the post purchase notes will tell which files to use for each type of printing. (Note parts too small to be hollowed out are agnostic to printer type.)
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144th scale vehicles where possible have locking turrets. These are designed such that the turret is placed in the hole at 45°; and then rotated. This enables the turrets to still be freely moved, but they will not fall out (even when upside-down) except at 45°; or 225°; and can safely be stored with the turrets in situ, saving the wargamer precious time on set-up and put-down that can be better spent on playing!
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Note that by design, the posts and post-holes are intended to be painted for a better friction fit. Some vehicles are supplied with additional turrets (notably, sensor masts, MLRS or engineering vehicle cranes) with both raised and transit positions.
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Starships are listed as "Fleet scale." The design assumption is (very nominally) 1/10000th scale for the capital ships, with fighters assumed to be approximately 1/1500th scale and larger smallcraft on a sliding scale between. (Where there is a balance between the bigger smallcraft being smaller than capital ships but larger than fighters and while fighters are not too small to be used or seen!)
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All starships, fighters and VTOLs that are physically large enough have a post hole designed to take a standard 3.2mm or 3mm flight stand. T
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here is a free, full pack of stands for this specification released on Creative Commons here, but each model will come with a suitable stand and base. Sci-fi models all come with an Entirely Optional Lore excerpt from Bleakbane's Galaxy Guide in PDF form. (In theory, as it's not showing up in the files; please let me know if this isn't working in my current approach.)
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(Aotrs stands for Army Of The Red Spear and is pronounced "A" as in "hay" -Oat -ers. I knew you'd ask...!)