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README.md

F17 FFMU

  • Fock 17: Free Folk Measure Up
  • d33pthought revision of FMDA/Ivan's G17

changelog

  • Jan 29, 2020: moved verification from here to new git repo. moved modification details to separate file. feedback: fosscad (f17 not included) -> d33pthought github
  • earlier Jan 2020: fixed gunstreamer links. added non-embellished frames. minor signature verification guide revision.

overview

This is a writeup for d33pthought's improvements to Free Men Don't Ask & Ivan's G17 model, which is patterned on the Glock G17 gen 3 frame. Included elements of this work:

acknowledgements

materials

  • 3d printer: Prusa MK3S
    • extruder nozzle: Ev3DM Tungsten Nozzle 1.75mm x 0.40mm
  • calipers (for slicer filament measurement)
  • printer filament: eSun PLA+ (including light blue, yellow, green, red)

print settings

  • slicing:
    • slicer: slic3r Prusa Edition v2.1.0
    • filament thickness as measured by caliper: ~1.70mm to 1.73 (depending on color/roll)
    • temp: 220 (225 & 230 also seem to work well)
    • resolution: 0.15mm (performed some at 0.10mm with some nicer detail but longer print time)
    • orientation: magwell up
      • with magwell down: significantly increases filament usage and print time, as well as surface (rather than interior) support artifacts
    • infill: 100%
    • supports:
      • z-contact: 0.20mm (0.15mm also works but it's more difficult to remove supports)
      • pattern: rectilinear (didn't see a huge difference vs. honeycomb when not using sheaths)
      • sheath: no (tried both ways, didn't seem to get a lot of help from sheath and it makes support removal much more difficult)

testing in 2019

  • mag-dump to failure
    • with mag dumping ~80 rounds at a time, failure achieved at ~120 rounds with deformation of the slide lock region
      • anterior slide lock wall with rearward deformation in shape of rear of recoil rod
      • slide lock itself sticking slightly into frame at superior posterior aspect due to milder deformation there
      • functionally resulted in failure to return to battery
      • slide and slide lock were extremely hot to the touch, likely exceeding PLA's transition temperature
  • subsequent testing with ~33 round mag dumps without any appreciable problems - though did switch slides after dumps when slide became too hot to touch with bare hands
  • would expect that various readily-available nylon-based filaments would not exhibit the failure noted above

ongoing modifications thoughts

  • when issues with fit and function - these might be classified into:
    • model problems (3d printing agnostic): e.g. pocket too large or small in model for known dimensions of part that goes into it
    • print problems: e.g. support interface artifact interfering with trigger reset via increased recoil spring friction
  • while ostensibly many of mods in this revision address model issues, some modifications may be overly optimized for specific print setup/settings
  • identifying such setup-specific optimizations will help make this model more generalizable for printing well in different print environments
  • much of the power and appeal of 3d gun printing is in lowering of the skill/tools threshold for manufacturing compared to machining
  • thus making it easier to take the model to a functional firearm can amplify this power and appeal
  • unresolved issues:
    • friction between rear trigger housing assembly & rear rails, resulting in a functional but often gritty trigger
      • with straight trigger pull gun seems to "jump" slightly to right
      • rails that have a shorter outward extension from midline might resolve this by allowing rails to be moved slightly from midline without increasing slide friction too much. without shortening this dimension of the rails though, increased slide/rear-rail friction will likely result in malfunctions. for now the gritty trigger seems preferable to malfunctions.
    • fitment into holsters
      • holsters like bladetech use the shape of the trigger guard to yield a tactile "click"
      • no significant click with this version - either due to modifications to have trigger clear guard, or due to initial FMDA differences from stock g17

feedback

  • please report if you have problems (or successes!), particularly if you have taken associated measurements of problem regions of your print re above modification goals
  • details and clarity are appreciated in feedback - e.g. reporting "0% modifications necessary" when you had to spend an hour filing and dremeling hurts the cause
  • feedback venues include: