The repeating crossbow is a Chinese weapon in history. Here is a miniature one that you can print at home. it has a same mechanism as the original. The arrows are made with plastic from cotton buds, so it not dangerous for kids.
Here is a Repeating Crossbow information
and here is my Assembly guide and testing video.
Printing area for "ALL-PARTS" files is 100 x 100 mm.
- Rubber band
- 2.5 mm diameter Cotton buds (length = 40 mm.)