The splat dualies from Splatoon I made for a cosplay. Made in Onshape by following the in-game model (plus a couple artistic choices: having the back nozzle part be hexagonal and adding a trigger guard so you can spin it in your hand).

Feel free to use as long as you give credit and such

For both dualies you'll need to print all parts twice (except the ones that have "mirrored" versions, for those print one normal and one mirror). Clearence might be a bit tight so feel free to scale them a bit for a better fit

ALSO you'll need a 4mm diameter tube for this. I made it with my spare bowden tube from my printer