Remix of https://www.printables.com/model/204388-your-color-change-buddy-dual-color-print-filament-
I used PrusaSlicer to add a hole into the "head" of the color change buddy design. When using a filament guide like the one in the picture, the filament doesn't want to suddenly bend downwards. The hole seems better at holding the filament in this configuration.
The 3mf file includes the original design STL, a negative volume cylinder for the hole, and increases perimeters to 4 for the first 5mms for added rigidity.
You won't be able to see the hole in the 3D preview on this website. Open the file in PrusaSlicer.
The author remixed this model.