This is a rival rail that glues onto the bottom of nerf kronos. It is easy to print and simple to put together. There is a One piece version and a 2 piece version(the 2-piece takes less supports). Before you glue on make sure you cut any seam off of the gun and scuff up the surface slightly. you also want to make sure that you do not put glue on one half of the gun because if you do, you can't take the gun apart. in the case of the 2 part, just glue the 2 halves together on the bottoms.

Print settings:

Nozzle Size: 0.6mm

Layer Height: 0.25mm

Perimeters: 3

Infill: 20% Gyroid

Supports: Yes

Raft: Optianal

Filament: PLA

Printer: Ender 3

If you have any questions or concerns, comment. Happy Printing!