This water gun is easy to assemble and print

This usually doesn't require glue, but it may still be necessary depending on the condition of your 3D printer.

How to assemble it?

The largest part of the printout is the main body. There is a groove on the main body, and before inserting a component that fits into the groove, a long mushroom-shaped rod needs to be inserted first. After inserting it into the groove, the remaining components are then inserted into the protruding rod of the main body.