I have printed these also, in 15mm, also some human knights also. When I print these I do a few test prints and find my exact scaling so that they will match my other metal 15mm miniatures. Many of my 15mm miniature are actually 18mm ( Demonworld, BattleValor) so instead of just printing at 150 percent, then maybe they get printed at 155 or 160 percent, ect, what ever makes them match best. If I am printing miniatures like Knights, I try to match to the horses, but if foot soldier I just try to match. Sometimes I may make them thinner or thicker when I print, if it make the best match to the other miniatures.
The only thing I dont like about these Forest Dragon sculpts is that the weapons are so huge. No easy way to deal the the huge weapons. some of the FD miniatures are holding weapons so big, like swinging a one handed sword that would be like 7ft long in real life. Other than that, I really like them.
There are a few other Patreons out there now that are also producing miniatures ment for 10mm Warmaster, which scale up to 15mm also. Some of them are doing the same thing, Weapons to large, or mounts to small etc. I have also 3d printed some miniatures which were originally meant for 28mm and scaled them down to 15mm .
Most of these STLs would also print nicely in 28mm, and I have printed a few that way. if you have your own printer, which everybody really needs who wargames, you can print to any scale you want to within reason . There is no reason you can not print up a entire 28mm army for 28mm Warmaster, or Warhammer. Im not a warhammer/Warmaster player, but honestly I cant see why Warmaster cant be played in 28mm, and really not sure how much difference Warhammer would be to Warmaster if if you changed scale, are they not essentially the same game?
All of my 15mm miniatures are single based on washers which I can then put on magnetic movement trays. Doing that I can play any game system I want, from skirmish to mass armies. of coarse the mounted units I mount on metal strips ( from a company called Warbases)
I have to say, you've painted them up real well, I only have painted a small handful up, as my painting has come to a stand still for the time being.
I really like 15mm, such a great scale.