I printed mine standing on the front edge with supports for the internal parts, doesn't seem to need much cleaning up and the spring and follower don't have layer lines to catch on. I figured this would also make the lip that catches the flange at the bottom of the magazine stronger, because I'm not relying on just the layer adhesion for strength. But it does make the hole for the screw not as strong, so I guess it's kind of a moot point. I'm using Duramic pla+, and printing at 215-220°, and it seems like pretty good stuff. Definitely better layer adhesion than some of the regular pla I've tried that prints at 190-200°. As far as the follower fitting in the base, I tried this on one of my ns522 5 round mags, and while it looks like the same follower, it's a tiny bit bigger and doesn't fit. Hopefully that's not just due to part variances, but printed with 4 walls, there's a bit of room to enlarge it if needed. A couple of the guys at the range were talking about +2 mag base pads for their Vudoos, so I've printed one for them to try out as well. That one I found on thingiverse though. Turns out there's a lot of that kind of stuff out there. I have a Wilson Combat 1911 22 conversion that uses GSG mags, and was able to print new followers that hold the slide back when empty and feed much better than the original GSG ones.
Kristian