I just pulled the test fin off and the results are pretty amazing. The supports popped right off with little trash left behind. The airfoil is a little wavy and will need some work but the strength is unquantifablely stronger! I could same a verticle print with no problem. The horizontal print will take tools! I am very happy with the result. 5 minutes with the file and a few more with some sandpaper will make this fin as good as it needs to be. The downsides that I am seeing now:
- post-processing - as expected, the leading/trailing edges need some attention but are not brittle or worrisome.
- printer bed real estate - I can barely get 6 fins on my current CR Ender 3V2 Neo (and it's really tight) in the horizontal orientation. Vertically, I can get 34!
So if strength isn't a concern then the verticle orientation will work for mass, though it seems like it takes 2x as long to print as with horizontal. For my smaller rockets, it's not a big deal but I have a few 4" kits to test this spring so I will probably be printing flat and sorting out the post-processing because, to me, the strength is worth the clean-up.