Are there any mostly 3D printed blasters?

As the title says. Everything printed except for the plunger tube, spring, barrel and O-rings. No screws, no bars, no rods. Did anyone create such a blaster?

Edit: looking for a full scale blaster to see how others handled possible issues since I want to design one myself.

Edit 2: it’s for a challenge between my brother and me.

Challenge:

Build a blaster using only 3D printed parts except for: 250mm of barrel, 250mm of plunger tube, a nexus pro spring, any amount of O-rings. The blaster should accept talon mags. Better blaster wins. Bonus points issued for design.