A game I'm attending asked me to swap out the black parts of the BK1S, so I've designed this file that replaces the pinned top rail with a 3D printed section that can be whatever color you desire.

Print settings

• The whole thing prints without supports, just be sure you have your printer set up to bridge the gap on the bottom in the slicer. I unchecked slow for overhangs and turned bridging speed up to 100, though ymmv