6 model

Free

Crossbow (Ballesta)

Thingiverse

Free

Ballista

Thingiverse

Free

dwarf ballista catapult

Thingiverse

Free

Umbar Ballista 10mm

Thingiverse

Free

Desktop Siege Weapon: Ballista

Thingiverse

Free

EasyPrint - Mounted ballista/heavy crossbow

Thingiverse