Skeletonized buttstock and "red dot"-style crosshair sight for the DIYPark Repeating Mini Crossbow (https://www.thingiverse.com/thing:2725597).
Scope snaps on and off with the 6 nubs positioned over the corresponding oval slots on the crossbow body. Attach the buttstock to back cap with epoxy, or merge buttstock model with back cap and print as one piece (DIY as crossbow licensing prohibits distribution of remixed parts).
Crossbow build tips:
It required a lot of fitting, using sandpaper, files, Dremel tool, drill bits. 5/32" bit on the pin holes. I used a pointed round file on the side notches where the bowstring catches until it released smoothly with each trigger pull.
The printed crossbow body is approximately 10mm wide. I scaled the back cap width to 110% to fit my print snugly. The front clip opening is 9mm wide and needed resizing as well. To fit the dovetails, I had to file and sand both sides of the mating surfaces.
The 3-piece front clip and right/left limb takes a bit of work to fit and assemble. Instead, I merged the front clip and limbs and printed them as a single piece. I scaled the limb height to 8.5mm so that it could be printed without supports.
- The ramp on the trigger (that lifts the cocked bow string) is too low and steep to work reliably. I modified the ramp portion of the trigger model, but you might be able to rescale it so that the ramp is 0.5-1mm higher and file it until it releases reliably.
Other crossbow accessories of interest:
Optical-style scope (https://www.thingiverse.com/thing:2931205)
Storage case and ammo/bolts (https://www.thingiverse.com/thing:3269538)