Heavy Duty Universal Catapult/Crossbow

!!!PLEASE WEAR PROTECTION!!! NOT A TOY!!! I CAN'T ACCOUNT FOR ALL THE DIFFERENT TYPES OF MATERIALS OR STRONG ELASTICS YOU WILL USE. SHARP PLASTIC FRAGMENTS FLYING AT YOUR FACE AT MACH 3 IS NOT FUN! PROTECT YOURSELF!!!

Demonstration: (Weak setup, using only a few office-tier small rubber bands)

Wanted to make a complete opposite of my older model, Concealed Catapult:

https://www.printables.com/model/545651-concealed-catapult

This one - much less concealed but MUCH more powerful. As powerful as the elastic you will use, and as safe as your common sense, print material and the amount of perimeters/infill. 

-All models are already in the correct printing position. No need to rotate. 

-Included nameplates so you can write something custom on them in the slicer and then stick on the angled slots on the sides.

-Picatinny and Dovetail rails on the bottom for laser/flashlight.

-Nuts and bolts included! But for the front/back connection I recommend grabbing a pair of “real” M8x30mm. Or just glue the two parts together. Or both. No need to substitute the grip bolts because they don't carry longitudinal stress and the tolerances may be a bit wrong since my printed ones aren't exact to any real metric. So the mechanism may fail, haven't tested.

-Screw and unscrew the threads a few times and clean them well. My bolts are scaled to 90% of their original size on the X/Y axis, works perfectly with my Prusa Mini+. Use your own judgement and scale further if needed.

-Supports: As shown in the pictures marked in blue. Not needed anywhere else or use your own judgement.

-Perimeters and Infill: I used 4 perimeters and 60% adaptive cubic infill with everything else being default 0.2mm quality preset. Use your own judgement. Should be very strong at these settings, but always be safe and careful!

-Size: The biggest part is just under 175mm. Will fit perfectly on a Prusa Mini with the skirt enabled. I printed this on a Mini+.

-Longevity: I recommend tying something strong around at the end of the barrel to not let the bolt hit the end stop (as shown). Depending on your elastic and print quality, it may break or may not. Better be safe.