Original design modified to fit a Hobbyking FPV250LLong frame.
Printed using PLA with a head bed temp of 65 degrees Nozzel temp 205 degrees.
Could do with a bit thicker top and bottom layer if you wanted it really flat, but strength does not appear to be compromised.
Trimmed the brim off and that is about it.
Used TinkerCad to modify
Took a bit of time measuring a printed version of the original and adjusting. The result has come out pretty well.
Thanks for the original design Nils