Free STL File Download

These files are free and ready for your printer. These files are for NON-Commercial use ONLY. Contact us before selling these files or parts to anyone.

Several file sets are remixed versions to make mass-production easier, aid in printing, etc. You can see the changelog from the original design below. 

Please reach out to us with any questions! Happy printing. 

If you don’t see the file you need here yet, please email support@frontlinefoam.com and we’ll get it to you. 


Print settings are included in each file name in the format of ([Perimeters],[Infill %]). “S” for support, and “SI” for recommended to be printed with Supports and a Support Roof Interface.

Axiom FILE DOWNLOAD

*SELECT FILES ONLY*

[CHANGELOG FROM ORIGINAL DESIGN]

– Modified to take 4-40 screws. Heatinserts can be used by drilling the screw ports to fit your size of heatinsert
– Widened magnet slots to take 8mm wide magnets for a stronger magnetic hold
– Modified switch cutout to take more brands/styles of 21A switch
– Modified MagPaddle to remove need for post-processing
– Added chamfers to bottoms of most parts to reduce elephant’s foot on prints
– Modified Trigger and shell halves for more reliable trigger fit
– Modified shroud for modular rails
– Widened inlet port to accept wider fittings
– Changed JamDoor and Shell halves to take 1/16″ pins (Caliburn) instead of printed pivot

Hardware available can be purchased at this link: Axiom Hardware

Purchase the full file set from Atch Attachments here

Bulwark FILE DOWNLOAD

*SELECT FILES ONLY* Buy the rest from the designer.

[CHANGELOG FROM ORIGINAL DESIGN]

– Deepened screw ports for use with full length shell screws
– Added wire channel cutouts to make wire management much easier
– Changed grip to use 21A switches
– Modified trigger shape to remove need for post processing and use of springs
– Added chamfers to bottoms of some prints to reduce elephant’s foot on prints
– Modified stock to include captive 6-32 hexnut for 6-32 thumbscrew
– Added cutouts in Gripinsert for screw heads

Hardware available can be purchased at this link: Bulwark Hardware

B-Variant FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Adjusted tolerances for many parts for easier assembly on a wider variety of printers
– Added chamfers on file bottoms to alleviate elephant’s foot
– Included printable AR Grip in fileset
– Added a solid piece Sear to be printed instead of modifying a priming bar
– Modified Bolt to use o-rings instead of super glue (see Indra and KronoMag for similar examples)
– Rotated models for correct print orientation. Load, Slice, and Go!
– Added print settings to file names in the format of ([Perimeters],[Infill %])

Hardware available can be purchased at this link: B-Variant Hardware

DOWNLOAD STL FILES HERE 

[CHANGELOG FROM ORIGINAL DESIGN]

  • Reports of C4’s with gaps were still an issue, so we added a bit of spacing to the STLs to compensate
  • Made top rail more uniform by removing unnecessary gaps giving more total rail to use
  • Mag release pin holes widened to remove need for drilling/filing
  • Removed unused top-hole features that were confusing people in assembly
  • Added indent in GripMain to hide knot if elastic is used
  • Trigger pin hole widened
  • Added screw port to act as spring rest if spring is used for Sear
  • O-ring grooves widened for better air-seal

Hardware available here: Caliburn 4 Hardware Kit

Click here to download CALIBURN FILE DOWNLOAD [CHANGELOG FROM ORIGINAL DESIGN] – Includes muzzle for brass barrel utilizing a clamp-retention – Top railgasm modified to take barrel adapter for tighter barrels – Mag release pin holes widened to remove need for drilling/filing – MilanCoupler walls thickened to reduce chance of breakage<br]>- Trigger pin hole widened – Rambase hole made smaller for better airseal between base and core – Plunger o-ring slot widened for better plunger airseal – Plunger hole widened to fit k14 spring – Frontbutt hole widened to fit k14 spring Hardware available can be purchased at this link: Caliburn Hardware

Click here to download

ESPER FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Added brim to foregrip print to increase print reliability
– Made hole in rambase smaller to create better seal between base and core
– Widened holes in mag release to remove need to file/drill pin holes

Hardware available can be purchased at this link: ESPER Hardware

Click here to download

FDL FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Widened hexnut slots to make them easier to install
– Added chamfer to pusher base removing need to post-process elephants foot

DOWNLOAD HERE

[CHANGELOG FROM ORIGINAL DESIGN]

– Fixed fatal error in side rails which made one side unusable

Hardware available at this link: GRYPHON HARDWARE KIT

Click here to download

HPA U TALON CLAW FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Modified Magfront to take 4-40 hex standoffs
– Added picatinny rail to magfront
– Thickened Magfront walls to prevent breaking from overightening barrel coupler screws
– Modified Magback to take 4-40 hex standoffs
– Modified mag release spring mount to take 4-40 screw
– Widened pin hole on mag release to remove need to drill/file
– Modified rearplate to include on/off labeling (very helpful imo)
– Designed and added top cover to protect SuperCORE
– Redesigned handle to fit regulator better
– Widened barrel screw pin for more clamping force
– Added battery door, compartment, and room for 6-32 thumbscrew to bottom of handle
– Changed grip to take 4-40 hex standoffs instead of hexnuts
– Reposition and resized pin holes to take 1/16 pins (Caliburn pins)
– Made more room for solenoid for easier wire management and diversity in solenoid compatibility
– Widened sideplates to cover more of the skeleton making the overall look more sleek
– Cut away a small section of the lower grip to allow for regulator outlet fittings to fit without dremeling/filing

Hardware available can be purchased at this link: HPA UTC Hardware

Click here to download

LEPUS FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Added 6-32 hexnut to base print for more durability
– Modified Nose to better fit Worker Hurricane wheels without rubbing on print
– Heightened Topcover slightly to fit Fang ReVamped motors and 130 sized motor shafts
– Thickened Nose top wall to improve TopCover installation durability
– Changed angle on nose to allow for full length shell screws to be used.

Hardware available can be purchased at this link:

Click here to download

Magpie FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Changed just about every part
– Adjusted CylinderPin to fit in frame without sanding or filing
– Added chamfer to ReleaseLever bottom to remove elephant’s foot
– Added chamfers to most bottom-facing holes to reduce post-processing of holes
– Widened slot in Hammer for compatibility with more springs
– Modified hammer to take 1/16 pin instead of screw
– Removed elephants foot on IndexingArm, Cage, TriggerSear, Frame pieces, Sights, and others
– Lengthened Pusher by 0.5mm to aid in timing
– Widened Pusher feet to reduce wear which caused pusher to get stuck in Hammer
– Widened hole in Trigger for 1/8 Pin (Spring Thunder/Viper pin)
– Removed elephant’s foot on trigger which caused inconsistent hole size
– Added retention feature on Barrel and Frame to better secure barrel
– Added internal cutouts in Grip for shell screw heads
– Shortened TopCovers to remove bowing that was present after assembly
– Removed angles on back of TopCovers which frequently caused warping and made the Covers not sit flat
– Added chamfers and made more room in the CylinderCover
– Widened dart holes in Cylinder which caused jams with new darts
– Widened slots on BatteryCover and Grip to create a looser fit for the cover
– Modified frame to create more room and new mounting method for switch
– Relocateed frame screw position for lower screw so full length screws could be used and not interfere with each other
– Modified SightRear to fit better in SightRearBase and sit flush with new TopCover
– Widened hole in CylinderArm to remove need to drill/file for CylinderPin

Hardware available can be purchased at this link: Magpie Hardware

Mamba LINK DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– In progress

Hardware available can be purchased at this link:

DOWNLOAD HERE

[CHANGELOG FROM ORIGINAL DESIGN]

– Redesigned Plunger a bit for more reliability. Uses two-piece design similar to B-Variant, Spring Thunder, and others. Also uses 123 O-ring shockpad
– Adjusted some tolerances for less filing during assembly
– Made RamEnd tapered so it wouldn’t get stuck in BarrelCap if inserted slightly rotated
– Added a catch lip to BarrelCap to prevent ramrodding a dart into the PlungerTube. Still can happen though, so open to other ideas as well
– Rotated parts into correct preint orientation
– Removed elephant’s foot on some parts

Hardware available at this link: FLINTLOCK MUSKET HARDWARE KIT

Pigeon Mark 7 FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Added brims
– Modified cage

– Adjusted screw port size and depths

Hardware available can be purchased at this link: Pigeon Mk7 Hardware

Pigeon Mark 8 FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Modfied overhangs on Frames, Slide, Mounts, Cage, and Trigger for reduced supports

– Modified Gear hole sizes to reduce post-processing

– Removed elephant’s foot on numerous parts

– Added brim to Grip scales

– Added spring rest to Cage for Katana MagRelease spring

– Reduced diameter of Pin to fit better in Cage

– Shortened nub on SlideSafety to more easily clear Mount for faster disassembly

– Added optional small washer to retain large gear

– Modified MotorTool to e able to be used after soldering

Hardware available can be purchased at this link: Pigeon MK8 Hardware

Click here to download

RAINBOW FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Original files created by Frontline Foam based off of the OG Rainbow design
– Merged catch circles into one piece
– Uses same shape and size plungerhead as Caliburn (Design by CaptainSlug)
– Added CatchCircle for K25 and K26 size springs

Hardware available can be purchased at this link: Rainbow Hardware

Click here to download

SNAKE FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Modified pin holes to take 6-32 flathead screws
– Modified TriggerLink to provide more travel

– Widened holes in Link for easier pivoting

– Modified Pusher shape for better retraction

– Modified Catch shape for easier insertion and removal of magazines

– Modified IronSight for a tighter fit in TopCover

– Modified cage to reduce supports and reduce “dart chew”

Hardware available can be purchased at this link: Snake Hardware

Snake V2 FILE DOWNLOAD

Snake V2 Nose Files DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Modified hole tolerances for better fit with pins

Hardware available can be purchased at this link:

Spring Thunder FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Widened some holes to make installing pins easier

– Modified PlungerHead to be a pressfit on plungerrod shaft

– Adjusted some tolerances to reduce post-processing

Hardware available can be purchased at this link: Spring Thunder Hardware

Talon Claw 4 (T4) FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]
– Widened RamB o-ring slot diameter for better airseal
– Added new stock options to fileset
– Added optional attachment point for Sear spring
– Removed unused holes/features from Grip and Muzzle
– Widened RearButt to allow use of Longshot sized springs
– Added PicatinnyTie mounts

Hardware can be purchased here: TALON CLAW 4 (T4) HARDWARE KIT

Talon Claw v4 FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Widened holes in RearPlate to more easily install SlidingButtstock

– Added custom RearPlate with buffer tube and Nerf stock options

– Added Muzzle for brass barrel

– Modified rambase for better airseal between ramcore and base

– Added modified Railgasm for use with barrel adpater

– Modified RearPlate for compability with Turf Longshot springs

– Added custom AR Shroud

Hardware available can be purchased at this link: Talon Claw Hardware

U Bullpup FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Thickened walls around hexstandoffs to increase part durability

– Modified rambase for better seal between ramcore and base

– Modified railsegments to remove brim

– Added modified ButtPlate for use with Turf Longshot springs

– Added modified Pcap plate for use with Aluminum Pcap Plate reinforcement

Hardware available can be purchased at this link: U Bullpup Hardware

U Caliburn FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Thickened hex-standoff walls for increased durability of parts

– Modified shuttle for use with barrel coupler

– Added new railsegment for cross-compatibility with U Talon Claw U Channels with v4 hardware

– Widened Plunger to take K14 spring

– Added modified Pcap plate for use with Aluminum Pcap plate reinforcement

Hardware available can be purchased at this link: U Caliburn Hardware

U Talon Claw FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Thickened hexstandoff slots to increase durability of parts

– Added modified Pcap plate to be used with Aluminum Pcap plate reinforcement

– Modified Shuttle for use with barrel adapter

– Added EndCap that is compatible with Turf springs

– Added new rail segment for use with v4 hardware

Hardware available can be purchased at this link: U Talon Claw Hardware

Viper FILE DOWNLOAD

[CHANGELOG FROM ORIGINAL DESIGN]

– Widened BreakLock hole to take 1/16″ pin (Caliburn pin)

– Shorted Cam to reduce friction of Cylinder on NoseBottom

– Modified NoseBottom to take 1/8″ pin (Spring Thunder pin)

– Modified Trigger pin holes in shells to take 1/16″ pin (Caliburn pin)

Hardware available can be purchased at this link: Viper Hardware

Woozi FILE DOWNLOAD

Updated Oct 18, 2022

Hardware can be purchased at this link: Woozi Hardware

[CHANGELOG FROM ORIGINAL DESIGN BELOW]
– Widened hole in gear for easer N20 installation
– Changed gear to use Shell Screw instead of Grub Screw to attach to N20
– Resized pusher to reduce friction on Lid, Gear, etc
– Reduced elephant’s foot on many parts to reduce need for post-processing
– Modified BatteryCover and Shell to take 6-32 Thumbscrew
– Widened trigger holes in Shell to remove need to file/drill
– Resized several screw ports so Shell Screws pass through one half, and grab into another instead of grabbing into both for QOL in assembly
– Adjusted several parts to print without or with less supports
– Modified cage for more reliable mag gravity drops
– Also modified cage to be both dual and single stage with one print

XC – FOAM KNIGHT DOWNLOAD

**NOTE: These files are NOT compatible with hardware kits by Foam Knight. You must use our hardware kit or source our hardware to print these files. 

CHANGE LOG: 

– Widened the threaded rod holes with increased tolerance so that the rods are easier to install (Handguard Middle, Grip Segment, Buttstock, Stock Spacer)
– Changed most hole sizes to fit #6 screws which are more standard than #8
– Changed Pump and priming Bars to use Caliburn standard foregrip screws (10-32 x 5/16)
– Changed the Elite Bolt to use 6-32 locknuts instead of the 8-32
– Lengthened Rival Retention Pin to make use of Rainbow springs and other springs
– Modified Magwell Release, Top Rail, Rival Magwell, Takedown Crossbolt, Rival Mag Release, and others to use extension springs and compression springs to use Caliburn, Viper/Snake and Rainbow hardware
– Removed the need for most locknuts (screws now drive into plastic)
– Modified prints to accept Caliburn plunger tubes
– Modified Mega and Rival Bolt to utilize Mega and Rival Caliburn ram o-rings

ZINC 2.0 FILE DOWNLOAD HERE

**Different hardware is required for these STL files to be compatible with 118 Design’s hardware kit** 

Hardware that is different is the following:

4-40 x 1 Flathead (Sear Pivot) QTY: 1
1/16 Pin QTY: 2
4-40 x 3/8 Flathead Screw QTY: 6

FULL CHANGE LOG: 

Front:
– Changed from pin to 4-40 flathead
– Widened Thumbnut holes a hair
– Changed screw holes for 4-40 flathead
– Widened center hole for smooth rod
Sear
– Changed to fit 4-40 screw and modified for slightly less supports
Rear
– Thickened o-ring groove for better seal in barrel.
– Changed holes to fit 4-40 flathead screws
Release
– Made slightly smaller for slightly better fit in frame
Cover
– Modified top hole for 4-40 flathead screw
Slide
– Modified top hole for 4-40 screw
– Removed slots for hexnuts
– Modified front and rear holes for 4-40
– Widened slide slightly to better fit Plunger Tube
– Widened center hole for smooth rod
Frame
– Removed slots for hexnuts
– Modified front and rear holes for 4-40 screws
– Modified roof for slightly better printing without supports
– Widened barrel hole for a looser push fit for barrel
– Changed pin slots to take 1/16th pins
Guard
– Changed pin hole size
Plunger
– Widened center hole for smooth rod
– enlargened threads for plunger core fit
Trigger
– Made hole slightly larger to better fit around better
– Removed material from either side for smoother fit in frame

Add-ons
Magazine
Body
– Modified overhang for mag catch to print with less warping
– Added built in brim to increase bottom surface area
Follower
– Added chamfer to base to reduce elephant’s foot