Please check back in at fb.me/SFCoPage for my new designs!

Please remember to wear eye protection whenever testing!

Thanks for checking out my thing. These files were previously available for sale, but If you like the thing, please consider making a donation.

Within you'll find several files, these will rely on your ability in 3D printing and are a moderate to advanced print for FDM printers.

Print 1:- PLA or PETG
Feed Guide
Index Mount
Sprocket
Sprung Index

Arrange the above files, vertically oriented as in the enclosed image, I print these on FDM (Ender 3) at 40mm/s 0.2mm layer heights and with supports enabled (Supports are only required for the bottom part of the sprocket, the rest is supportless)
Precision is preferable over speed for this print.

Print 2:- PLA or PETG
B Clip

Arrange as many B Clips as you'd like (1 less than the number of shells, but treat yourself, one might fail!) on the bed and print with the above settings

Print 3:- PETG
B Round

//Old Information // Arrange as many B Rounds as you'd like, for this you have to balance speed and precision. Using some 6 month old PETG I was seeing a 1 in 12 initial failure rate on the rounds printed so maybe factor that in.
I'd print these at 0.2mm heights but 0.28 is an option. I have ALWAYS needed a 'brim'(Cura) for a successful print of these shells to stop them from unsticking, but you might be a neater printer than me!

//NEW B Round// the B Round 6x5mm is the superior cartridge for feeding, fps, and failure rate. the 5mm refers to the approximate depth of the BB chamber in the shell, this allows for the best feeding and most consistent FPS. Try and print these rounds with a brim to stop them from toppling mid-print, still printing these in 0.2mm heights at 40mm/s.
I'd recommend setting the Z Seam to random if using Cura, to avoid having a single weak 'seam' on the shells.

That should be it. Obviously if you're printing the B Clips in PLA or PETG you can add them to the same print bed as the other prints.

Good luck and good printing!

PLEASE NOTE THAT THE B ROUND TRI IS AN UNTESTED VARIANT AND MAY BEHAVE UNPREDICTABLY. Please always wear eye protection, but especially so when testing newly printed rounds.