I have not personally tested these files yet, they have been uploaded by the request of a few of you. Please comment back here with success or needed changes.
These are my current settings for Cura which produce good results, especially on rails up 2A prints but should work good for all. You may wish to alter the support z height to .17 or even .2 if you have excessive trouble removing supports or if your supports will be in very difficult to reach areas. I have achieved the best results with .15-.17. Supports should be somewhat difficult to remove but not scar the print.
Has been tested by multiple people and everything worked well, if you have any trouble let me know. Includes Step file of blank grip for modification. Grips were meant to be glued in but so far everyone says they fit so well they have not bothered, personally I think it may add some strength to glue them in but that is totally up to you!
Og basic frame by Freeman, thanks!