20 Gauge Shotshell Pack replicas and snap caps

A 20 gauge shotgun shell, also known as 20ga or 20G shotshell, is a centerfire shotgun cartridge. Centerfire shotgun shells were designed in the mid 1800s.

Includes 2 lengths: 2 3/4in (most common, 2.75in, 62mm), and 3in (68mm).

Note: Shotgun shells are measured by the total length of the uncrimped/unfolded shell. The actual length of a loaded 2 3/4 inch shell is around 2.5in.

Print this for props, display, education, training, or just because it's cool.

Contains 9 files:

- Accurately sized replicas: 20ga_2.75in_cartridge.stl, 20ga_3in_cartridge.stl

- Separate brass head and case pieces for easily printing in different colors: 20ga_2.75in_head.stl, 20ga_2.75in_case.stl, 20ga_3in_head.stl, 20ga_3in_case.stl

- Snap cap/dummy rounds for cycle and dry fire practice, with firing pin hole and reduced case size: 20ga_2.75in_snapcap.stl, 20ga_3in_snapcap.stl

- Information txt file with recommended print settings: 20ga_pack_info.txt

Originally uploaded on Thingiverse: https://www.thingiverse.com/thing:6139032

Print Settings:

- Material: Tested with PLA and PLA+/PLA Pro.

- Overall print size: 68.4mm tall (3in cartridge), 19.46mm diameter.

- Layer Height/Quality: 0.16mm or less recommended, 0.12mm works best.

- Infill: 20% is fine for display, 30% or more recommended for snap cap use.

- Print Speed: 50mm/s or less recommended. I do 40mm/s overall speed and 10mm/s initial layer speed.

- Adhesion: A brim might be needed, depending on the printer and bed type. I have a textured PEI bed, and with proper calibration, additional adhesion isn't needed.

- Post print: The pieces may require some sanding or filing for proper fitment if the bottom layers bulged out a little. Fitment should be a little snug, but easy to take in and out. A properly calibrated setup shouldn't need additional work.