Shotgun Barrel Inserts (2x/3x Short Dart, 2x Elite) ___ for foam dart blasters

Update

Shotgun Barrel Insert (2x/3x Short Darts or 2x Elite Darts)

Fits most front-loading foam dart blasters and 13mm inner diameter barrels. 
 

Works great with small blasters like the X-Shot Micro2.0
(removing the air restrictor and dart post of the Micro2 is recommended to get the best performance)

X-Shot Micro 2.0 + Shotgun Barrel Insert max FPS test:
3x Short Darts = 62 FPS (X-Shot Short Darts)
2x Short Darts = 73 FPS (X-Shot Short Darts)
2x Elite Darts = 74 FPS (X-Shot Elite Darts)

Attach suitable o-rings to the grooves of the barrel insert to seal it against the blaster barrel.
If you only have one O-ring, attach it to the rear O-ring groove – this serves as a seal. The front O-ring serves more as a stabilizer and can be omitted or replaced with e-tape for example.

As with all printed barrels, it is always a good idea to sand the inside of the barrels with a rolled up piece of sandpaper to smooth it out a bit and to remove any elephant feet that may be present.

• Update 2.5.2025:
  Extended the barrels of the 3x Short Dart (cylinder) version by 7mm. The Short Darts there are now flush with the barrels, and the tips no longer protrude.
• Update 5.5.2025:
  Added a barrel insert for 2x Elite Dart.
  Added an alternative version for 3x Short Dart.
• Update 6.5.2025:
  Added a barrel insert for 2x Short Dart.
• Update 7.5.2025:
  Extended the barrels oft the 2x Short Dart version slightly in length and made them tighter to get more FPS out of it.
   

The files are already pre-oriented.

My print settings for PLA:
0,2mm layer height
4 walls
7 top and bottom shell layers
20% gyroid or cubic infill
(print with outer brim if you have poor bed adhesion)
>>> No supports needed