I use Urethane resin (Smooth-on) which is probably the best quality in the market with which you get the closest to the plastic parts and has been use in several Xigfrid designs also tested in the biceps spares of the yamato zero ( https://www.macrossworld.com/mwf/topic/32045-160-yamato-vf-0a/page/4/ ) and until now there have been no breakage reports so I can assure you much more resistant than 3d print (and cheaper)