16 of the T04s trucks in HO scale, see the HOt04s for details. Wicking in some thin CA glue will strengthen parts. Because of their fine detail, Frosted Ultra Detail is the preferred material, others will show varying degrees of surface roughness. The strong flexible materials will be crude and may not even print because of the thin sections. WSF and WSFPolished will be rough and lack detail, WSF looks like 200 grit sandpaper.