SFAv2 is HERE!! 

If you have this version currently I highly suggest making the v2 clips and end stops!

Getting in to 3 gun and other competitive shotgun shooting sports is expensive. After the heart attack inducing prices i have seen of other shell caddy's i decided to mix together some of the things i saw that i liked and also added in my own ideas and I ended up with these shot shell caddy's for quad loading. I designed several variants of this myself and after several prototypes I have landed on this design.  

Made for ELS mounts

The 45° back mount would be for position 1 Left (assuming your junk is position 0).

The 18° back mount would be for most other positions Left or Right.

If you want a right side Caddy you will need to mirror the retainer set, end stops and 45° back mount in your slicer.

I reccomend a heavy Wall count and Top Bottom count for strength, with 0.4 Nozzle would use wall count of 6 and top bottom at least 5, infill a minimum of 60%, I used Line infill.

I printed mine from PETG and CF PETG with 0.6 Hardened Nozzle and am still in the testing phase, would really like to see some printed with Nylon or ABS but i do not have that capability.

Hardware Required for the shell caddy-

(12) M4x6 Embedment Nuts

(21) M5x7x8 Embedment Nuts

(4) M5x7x10 Embedment Nuts for the ELS mounting points - Probably OK to use all M5x7x8's

(6) M4x15 screws

(6) M4x20 screws

(12) M5x10 screws

(13) M5x20 screws

I used all flanged buttonhead screws because of the low profile head which means more clearance between your shells and your fingers and overall just a cleaner look. I got all my hardware and ELS mounts from Amazon.