Never being satisfied with good enough I've spent the last couple weeks remodeling and tweaking the original design. Initially I started making some small changes with the goal of eliminating some of the hardware but I eventually got around to making it more modular and bigger to make better use of my 200x200 mm build plate.
I separated the side walls from the base mostly so I didn't have to reprint everything if I wanted to make some changes to the base. The side walls are plenty strong at 3 perimiters (1.2 mm) thick.
I designed printable spring flipper to eliminate the spring and screw. It works well on initial testing but I need to tweak the shape of the tip a bit because it's been knocking out upside down bullets.
The drop tube spring adapter is hardware free on the top end. The connector just snaps into the base and the spring threads into the connector. The bottom end used a long lever limit switch like the one that comes on the MBF but a straight arm that just snaps in. I don't have any bullets smaller than 124gn but I tried a 1/4" driver bit that weighed 73gn that went through easily. I need to find something around 50gn to test.
The flipping plate adjusts in and out with a screw rather than using a set screw so it's easier to tune.
The flipping ramp is a separate piece so you can adjust it out or replace it with a taller one if necessary.
This takes 6 cap head screws, 2 set screws, 4 nuts, plus the electronics to assemble.
Movie --->
https://imgur.com/bW6tkZj
Movie with flipper --->
https://imgur.com/zuouuAZ
Any feedback is appreciated.