Variable Transition Lengths are useful for prints when you're using filaments that are very different from each other—like the black and white filaments in this penguin print.
When this happens, it's ideal to have a longer length to transition from black to white as the black filament could easily bleed into the white portions of the print. However, the transition from white to black could be shorter as this causes less chance of bleeding. Variable transition lengths help to reduce color bleed by optimizing transition lengths for each filament.
To use this feature, first turn on Advanced Settings in Chroma by going to Tools > Preferences > Enable Advanced settings. Once this is turned on, go to the Transitions tab in your Printer Profile to set a Min and Max Transition Length.
On Chroma's main screen where you select the drive colors, you'll notice a slider which allows you to select each color's pigment strength. The transition length that is used between these filaments will be adjusted based on the two colors' strengths.
In this print, for the white filament, we'd select Weak; for orange, we'd select the middle option; and for the black filament, we'd select Strong. This will use less filament when transitioning to black, and more filament when transitioning to white.
If you have any additional questions about how to use Variable Transition Lengths, please send a message to firstname.lastname@example.org.