3d model of the bombard designed by Leonardo DaVinci (see https://commons.wikimedia.org/wiki/File:Bombarda_interattiva_tratta_dal_disegno_di_Leonardo_da_Vinci.png ). The final model is composed by some parts that need to be assembled together. Here are the printing instructions : 1) print 1x bombard_base 2) print 1x bombard_halfarch_easy 3) print 1x bombard_cannon 4) print 2x bombard_big_pin and 2x bombard_big_pin_quad 5) print 1x bombard_handle_small (either in vertical with brim or horizontally) 6) print 1x bombard_handle_big (either in vertical with brim or horizontally) 7) print 1x bombard_handle 8) print 1x bombard_handle_screw (in vertical with brim) Here are the assembly instructions : 1) place the "bombard_halfarch_screw" inside the slot in the "bombard_base" and then insert both "bombard_handle_small" and "bombard_handle_big" inside the respective holes and insert them inside the screw (place a drop of glue if needed) 2) insert the "bombard_handle" in the "bombard_handle_big" from the outside of the "bombard_base" 3) insert the "bombard_big_pin_quad" inside the "bomard_halfarch" holes in order attach the "bombard_cannon" 4) insert the "bombard_halfarch" together with the "bombard_cannon" to the base and use the "bombard_big_pin" to attach it to the base Now you can use the handle to move the cannon. If you want you can also use a more realistic but more difficult to assemble half arch version: print 1x bombard_halfarch + 11x bombard_small_pin insert the pins inside the half arch holes (if you need use pliers) If you want you can print the "bombard_base_internal_view" instead of the "bombard_base" in order to let you see the mechanism inside that let the cannon move. 3D printing settings : total printing time: about 3 hours layer height: 0.20 mm or 0.15 mm no support needed Enjoy it!