These characters were designed for our sci-fantasy tabletop RPG, Wayfarer: Things Beyond Wonder and for our modular wargaming system, Wayfarer Tactics. If you want to print a 28mm scale version, just scale it up by 180%.
We've set up a Patreon page for anyone who's interested in helping to fund us so we can keep making free and open sourced games like Pocket-Tactics, Wayfarer Tactics. and others, not to mention the growing catalog of gaming miniatures that you can use for whatever you want! (Psst... we take requests and commissions...)
These models will print best with SLA/DLP resin machines (like the formlabs) though should work better when enlarged to 28mm scale on an FDM machine.