I needed a holder for my scraper, but I did not want it mounted to my filament reel holder, I wanted it on the frame of the printer. Using the body of the holder that Toonies designed and the T nuts that DaVinci2000 designed, I mashed them together in TinkerCAD I printed it with the T nuts to the top of the print. The back side of the nuts needed a smidge of sanding and then the part slid into the channel no worries

EDIT added a new STL file that should eliminate the need to san the nuts for proper channel fit