fnx 9mm 40 3d printed

FNX940 STL Files

3D Printed FNX in 9mm & .40S&W

FNX940 Details

The FN FNX pistol is a series of semi-automatic, polymer-framed pistols manufactured by FN America. Introduced in 2009, it is chambered for the 9mm, .40 S&W, and .45 ACP cartridges.

The 3D printed FNX940 by Vinh Nguyen is modeled after this pistol and compatible with both the 9mm and .40 S&W FNX versions.

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A few of the design concepts were derived from the previously released 3D printed FNS940 model by TMS.

This printed FNX uses plates for rails, rather than a monolithic locking block or integrated into the fire-control housings.

FNX940 in the Wild



Required Parts for the FNX940


1 x FNX Parts Kit 9mm or .40S&W

1 x FNX Magazine Compatible with your Chosen Caliber

3D Printed

  • FNX Frame

Tools Required

  • Gunsmithing Punch Set
  • 4.0mm Drill Bit
  • Narrow, but not needle nose, pliers
  • Flathead screwdriver

The following tools may help, but are not required:

  • Flathead screwdriver

Suggested 3D Print FNX940 Settings

The slicer settings for the 3D printed FNX940 include the following suggestions:

Nozzle Size: 0.4mm

Layer Height

  • Height: 0.2mm
  • Initial Height: 0.14mm

Orientation: Rails Down

Infill Density: 100%

Supports: Tree Supports

Bed Adhesion: Preferred


  • PLA+
  • Tough PLA


v1.0: Release

  • Promotion to release

v0.4: Private Beta Candidate 4

  • Revised front takedown lever clearances
  • Omitted horseshoe geometry
  • Refined front rail fitment geometry

v0.3: Private Beta Candidate 3

  • Loosened tolerances for rear rail plates
  • Loosened tolerances for front rail / locking block places

v0.2: Private Beta Candidate 2

  • Added right-hand safety selector cutout
  • Re-introduced some takedown-lever geometry
  • Tightened tolerances for the front locking block plates

v0.1: Private Beta Candidate 1

  • Initial commit

FNX parts kits are fairly rare and hard to obtain. If you are able to get your hands on this parts kit 3D printing your own FNX is a great way to honor this historical piece!

Is something missing or incorrect?

DISCLAIMER: 3D STL files are for learning and documentation purposes only. The users of this website and files need to be aware of all applicable local, state, federal and regional laws. 3D Gun Builder does not encourage, condone, or promote any illegal activity.

3D Gun Builder (3dgunbuilder.com) does not host, provide, develop, and/or have any affiliation with the firearm STL files or 3dgunvault.com. All files are hosted by a third party.

Dan M.
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