Sugar Cube Bow/Crossbow Launcher - Sweet Critical Hit

Model Introduction:
This model is named after its sugar cube-shaped projectiles, come and experience the sweet critical hit
Previous “bow/crossbow launchers” required larger slider arrow projectiles, which produced some waste. Therefore, I have been exploring how to make the projectiles smaller. After improvements, this bow/crossbow launcher can fire small sugar cube projectiles. It not only retains the advantage of the previous model's ability to extend the barrel length, but I also redesigned the trigger hook so that it can function as a launching mechanism while also securing the projectile
All parts of the model are printed on a single plate. The model adopts a modular design. If any part is damaged during use, you only need to reprint the corresponding accessory 
Installation Process:
This model includes 12 types of parts: upper plate, lower plate, trigger hook, hex shaft (hex bolt), barrel (left), barrel (right), end cover plate (left), end cover plate (right), end connecting plate, extended barrel (left), extended barrel (right), sugar cube projectile
1. Place the upper plate onto the lower plate, aligning the holes. If it doesn't fit snugly (the fit dimensions may be affected by the printing environment and filament), it is recommended to use rubber bands for fixation (as shown in the rightmost annotation); adhesive can also be used for fixation, but this makes later disassembly and replacement of parts difficult

2. Use bolts and nuts to connect the left and right extended barrels to the upper plate. Install the appropriate number of extended barrels according to actual needs (a pair of extended barrels is included on the print plate)
3. Connect the left and right end barrels to the extended barrels with bolts and nuts; if no extended barrels are needed, the end barrels can be directly connected to the upper plate

4. Connect the left and right end cover plates and the end connecting plate to the end barrels and secure them with bolts and nuts. During installation, clamp the launching rubber band inside the serrations; to ensure launch quality, try to adjust the length of the rubber bands in the clamping sections on both the left and right sides to keep them consistent

5. Use the hex shaft to connect the trigger hook to the lower plate
6. Install the trigger rubber band (a regular rubber band will suffice, as shown in Figure 1) and secure it on the protruding clip of the lower plate (i.e., the “trigger rubber band” position in the image above) to allow the trigger hook to automatically reset after release. Refer to the GIF demonstration for specific operations
7. Finally, draw the bow fully so that the launching rubber band is caught behind the trigger hook, load a sugar cube projectile into the sugar cube projectile slot, pull the trigger, and fire
PS: To further secure the barrel, it is recommended to glue the end connecting plate and the end cover plate for an improved user experience
In addition to the printed parts, you also need to prepare the following accessories: 1 launching rubber band (large elastic rubber band), 1 trigger rubber band (a regular rubber band will suffice), 1-2 tail rubber bands (a regular rubber band will suffice), 6 sets of M2x15 screw and nut sets—6 sets for the basic configuration. If extended barrels are needed, an additional 2 pairs of bolts and nuts are required for each additional pair of extended barrels
Firing Principle:
After pulling the trigger, the sugar cube projectile naturally drops due to gravity. Since the gap in the middle of the barrel is smaller than the sugar cube projectile's size, the projectile rests on the barrel. At the same time, the launching rubber band detaches from the trigger restraint, rapidly retracting forward and launching the sugar cube projectile

Welcome:
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