I've put together a remix of a couple of models (TigerAce's Pz1A, and Bergman's ammo trailer) into a pair of Munitionsschlepper auf Pz1A in 1:100 scale (15mm). They're reasonably printable in FDM, but a resin printer would do a much better job on these little vehicles.
You can download the STLs (free) at
https://www.wargaming3d.com/product/munitionsschlepper-auf-panzer-1a/First test prints (below). As expected, the tracks didn't print especially well, because although they're nicely detailed they a bit thin, and my FDM printer struggles with that sort of thing, but at least they're there and I can disguise the worst of the ugliness with mud and gunge.