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Primus V1.1 - a single shot nerf homemade
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This is my first homemade foam flinging dart blaster, enjoy!
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Updated at source:
Model information
- Source
- Printables
- Category
- Other Toys & Games
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
Primus V1.1
update 04.02.2024: V1.1 (untested)
- Prime rod and plunger head now print with a modelled M12 thread, one less
- Prime rod is also slimmer, reducing weight
- Slightly decreased O-ring groove diameter of the plunger head as it was a bit too tight
- Modified catch to pair with the new prime rod
- Casing_grey no longer takes a hard-to-get aluminium profile, geometry was also adapted to take the new plunger rod, minor adjustments to rear sight were made
- Slightly adjusted dimensions of trigger to reduce slack, rounded finger contact area for comfort, (backwards compatible, replaces old file)
- Added a 15mm and no metal barrel version of the barrel shroud and muzzle (backwards compatible, added variation)
- Personal note: I will not further update this model because I am working on a revamped version, since I released this initially I have upped my modelling skills and I want to make the whole thing more elegant in assembly
general information
For easier identification, every printable part has been given a distinct colour in the assembly manual and as a file name, e.g. pistonrod_yellow.
I included a step and f3d file to make remixing and editing easier.
printer setting recommendations
- 20% infill, except for catch and piston rod
- catch and piston rod 50%+ infill, and/or 5+ perimeters
- all parts can be printed without supports
assembly
see primus_assembly.pdf
hardware
| 6x | M3x10 phillip's countersunk flat head screw (as of V1.1, 5x) |
| 2x | M3x12 phillip's countersunk flat head screw |
| 8x | M3 nut (as of V1.1, 7x) |
| 1x | 22x2.5 O-ring (22 is inside diameter) |
| 2x | 22x3.5 O-ring (22 is inside diameter) |
| 1x | 70mm x 17/32" or 70mm x 15mm OD tube (Brass/Aluminium) or none (see barrelshroud file variations) for 15mm, chamfer outside edges |
| 1x | 10mm long 15.5x1.5 square aluminium profile (as of V1.1 no longer needed) |
| 1x | 10 mm long, 6.5mm OD spring |
| 1x | longshot spring (spring used: blasterparts 9kg longshot tuning spring, 130x26.8x2) |
| 1x | 40x130x2 acrylic tubing (one inside edge chamfered 1-1.5mm) |
| 1x | 3x26 metal pin (or metal rod cut to lengh) |
| 1x | 4x26 metal pin (or metal rod cut to lengh) |
| - | lubrification |
tools
- 3mm and 4mm drill bit
- scalpel/exacto knife
- mallet (potentially for brass barrel and aluminium profile)
- PH1 phillip's screwdriver
technical data
| blaster type | single shot frontloader |
| draw lengh | 81.5mm |
| barrel lengh | 70mm |
| plunger volume | 81.43cm^3 |
| spring precompression | 20mm |
| catch type | caliburn catch |
| caliber | 12.7mm (.50") |