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Today's beta release has looser tolerances all around, to accommodate a 0.6mm nozzle.
Larger nozzle is intended for carbon fiber filled, but perhaps plain PETG is enough for some.
Intended to fire 3" magnum shells, and not harm the operator, beyond a sore hand from recoil.
Remember this is an early beta, and you should cautiously field test, until the design is finalized.
Please use string to pull the trigger, with retail 12 gauge powder loads, especially 00-buck rounds.
All functional mechanical parts are included, with adjusted tolerances:
Where the first receiver release had 8.2mm pin holes, this second release has 8.3mm pin holes.
The trigger and hammer had 8.2mm pivot holes before, and those are now 8.4mm pivot holes.
The breech face has slightly wider bolt holes, bigger glue channels, again for the larger nozzle.
Printed NPT threads now require PTFE plumbing tape, at the breech threads, for a tight barrel fit.
Changes are intended to allow lower end printers to print finished parts, with no after processing.
Required 3D printed parts (60mm/sec avg print speed):
ReceiverFrameBack.stl - (11hrs @ 0.15mm layers, 20 walls/perimeters, 100% infill, 141g filament)
ReceiverFrameFront.stl - (3.8hrs @ 0.15mm layers, 20 walls/perimeters, 100% infill, 46g filament)
FiringPinRetainer.stl - (50min @ 0.10mm layers, 20 walls/perimeters, 5g filament)
SafetyPullTab.stl - (11min @ 0.10mm layers, 20 walls/perimeters, 2g filament)
HalvedPin.stl - (4 copies, 33min @ 0.10mm layers, 20 walls/perimeters, 5g filament)
Trigger.stl - (34min @ 0.15mm layers, 20 walls/perimeters, 8g filament)
Hammer.stl - (1.9hr @ 0.15mm layers, 20 walls/perimeters, 21g filament)
Optional 3D printed grips & accessories (included, not for initial testing):
RaptorGrip.stl - Slide on grip, designed as the default for this shotgun receiver.
GripTemplate.stl - Slide on grip template, allowing anyone to design their own grip.
AngledForeGrip.stl - Thread on foregrip, attaches to far end of NPT gas pipe barrel.
VerticalForeGrip.stl - Thread on foregrip, attaches to far end of NPT gas pipe barrel.
PipeClampMount.stl - Snap on pipe clip, store out of sight, with quick pull access.
Required hardware store parts (for single shotgun; much lower part costs, making multiple):
1x box 4D common steel nails (330qty, $6.99, Lowes): used as firing pin, and both pivot pin cores.
1x bag of assorted rubber bands (200qty, $2.99, OfficeMax): used for the hammer, and trigger return.
1x pack of #8-32 x 2 inch steel bolts (6qty, $3.35, Lowes): combines printed receiver front and rear.
1x length of 3/4" NPT steel gas pipe ($Varies, Lowes): used as the thread-on 12ga barrel.
Required hand tools and other supplies:
1. Wire cutters. Needle nose pliers with built-in wire cutters will work. Needed to cut nails to length.
2. Power screwdriver. Because you don't want to turn those six bolts, 128 half-turns each, to install them.
3. Super/CA glue and/or JB Weld epoxy. Needed to assemble the 3-piece hammer, and secure the steel bolts.
4. Sandpaper or metal file. Use 60 to 200 grit to chamfer the tip, of the 4D common steel nail, firing pin.
5. Two pennies. Use glue, and insert the pennies into the hammer head, to serve as rear blade sights.
6. Small diameter wire or safety pin. 1mm galvanized wire works best, to lock the receiver pivot pins.
7. Piece of transparent filament. Glue in a 0.5" piece of filament as the front 'day-glo' sight.
Recommend 0.6mm hardened steel nozzle ($7). Recommend PETG ($14/1kg) and PETG-CF ($20/1kg) filament.
Recommend 0.15mm layers for receiver, trigger, and hammer. Recommend 0.10mm layers for pins, safety, firing pin retainer.
Recommend JB-Weld 24hr epoxy for receiver assembly ($7/2oz, $18/10oz), smushed in receiver rear breech face bolt holes.
Recommend gap-filling amount of epoxy between the receiver rear, and the slide-on grip, to prevent shearing from recoil.
Feedback & Test Results: https://www.reddit.com/r/ProletariGatCAD
Designer Contact: mailto:rrab@tuta.com
LBRY Tags: 3d2a; guncad; c:disable-slimes-video; c:disable-slimes-comments
Larger nozzle is intended for carbon fiber filled, but perhaps plain PETG is enough for some.
Intended to fire 3" magnum shells, and not harm the operator, beyond a sore hand from recoil.
Remember this is an early beta, and you should cautiously field test, until the design is finalized.
Please use string to pull the trigger, with retail 12 gauge powder loads, especially 00-buck rounds.
All functional mechanical parts are included, with adjusted tolerances:
Where the first receiver release had 8.2mm pin holes, this second release has 8.3mm pin holes.
The trigger and hammer had 8.2mm pivot holes before, and those are now 8.4mm pivot holes.
The breech face has slightly wider bolt holes, bigger glue channels, again for the larger nozzle.
Printed NPT threads now require PTFE plumbing tape, at the breech threads, for a tight barrel fit.
Changes are intended to allow lower end printers to print finished parts, with no after processing.
Required 3D printed parts (60mm/sec avg print speed):
ReceiverFrameBack.stl - (11hrs @ 0.15mm layers, 20 walls/perimeters, 100% infill, 141g filament)
ReceiverFrameFront.stl - (3.8hrs @ 0.15mm layers, 20 walls/perimeters, 100% infill, 46g filament)
FiringPinRetainer.stl - (50min @ 0.10mm layers, 20 walls/perimeters, 5g filament)
SafetyPullTab.stl - (11min @ 0.10mm layers, 20 walls/perimeters, 2g filament)
HalvedPin.stl - (4 copies, 33min @ 0.10mm layers, 20 walls/perimeters, 5g filament)
Trigger.stl - (34min @ 0.15mm layers, 20 walls/perimeters, 8g filament)
Hammer.stl - (1.9hr @ 0.15mm layers, 20 walls/perimeters, 21g filament)
Optional 3D printed grips & accessories (included, not for initial testing):
RaptorGrip.stl - Slide on grip, designed as the default for this shotgun receiver.
GripTemplate.stl - Slide on grip template, allowing anyone to design their own grip.
AngledForeGrip.stl - Thread on foregrip, attaches to far end of NPT gas pipe barrel.
VerticalForeGrip.stl - Thread on foregrip, attaches to far end of NPT gas pipe barrel.
PipeClampMount.stl - Snap on pipe clip, store out of sight, with quick pull access.
Required hardware store parts (for single shotgun; much lower part costs, making multiple):
1x box 4D common steel nails (330qty, $6.99, Lowes): used as firing pin, and both pivot pin cores.
1x bag of assorted rubber bands (200qty, $2.99, OfficeMax): used for the hammer, and trigger return.
1x pack of #8-32 x 2 inch steel bolts (6qty, $3.35, Lowes): combines printed receiver front and rear.
1x length of 3/4" NPT steel gas pipe ($Varies, Lowes): used as the thread-on 12ga barrel.
Required hand tools and other supplies:
1. Wire cutters. Needle nose pliers with built-in wire cutters will work. Needed to cut nails to length.
2. Power screwdriver. Because you don't want to turn those six bolts, 128 half-turns each, to install them.
3. Super/CA glue and/or JB Weld epoxy. Needed to assemble the 3-piece hammer, and secure the steel bolts.
4. Sandpaper or metal file. Use 60 to 200 grit to chamfer the tip, of the 4D common steel nail, firing pin.
5. Two pennies. Use glue, and insert the pennies into the hammer head, to serve as rear blade sights.
6. Small diameter wire or safety pin. 1mm galvanized wire works best, to lock the receiver pivot pins.
7. Piece of transparent filament. Glue in a 0.5" piece of filament as the front 'day-glo' sight.
Recommend 0.6mm hardened steel nozzle ($7). Recommend PETG ($14/1kg) and PETG-CF ($20/1kg) filament.
Recommend 0.15mm layers for receiver, trigger, and hammer. Recommend 0.10mm layers for pins, safety, firing pin retainer.
Recommend JB-Weld 24hr epoxy for receiver assembly ($7/2oz, $18/10oz), smushed in receiver rear breech face bolt holes.
Recommend gap-filling amount of epoxy between the receiver rear, and the slide-on grip, to prevent shearing from recoil.
Feedback & Test Results: https://www.reddit.com/r/ProletariGatCAD
Designer Contact: mailto:rrab@tuta.com
LBRY Tags: 3d2a; guncad; c:disable-slimes-video; c:disable-slimes-comments
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