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I work for 3DSystems in product development. So I am using resins that are for industrial printers. It looks like TG15 (Tough Grey) should work.

I will let you know when I have settled on an OD for the low power rocket I'm currently working on. It should be in the neighborhood of 26mm, though I might just go 29mm to make it simple. I have the rail guides from Apogee that I want to test against. I had some issues at the launch event, but I think it could have been that the rails were dirty or dinged up from use.

I'll also take out my own rail next time. That way I can make sure it is in good shape.

I could have three clones and still not get everything that needs doing done... :-/