With the latest craze of Dual-Color/2-Color/etc. filament (where half the filament is 1 color and half is another), an interesting challenge exists: how do you orient your part?
MatterHackers (one of the makers/sellers of a brand of some dual color filament) recommends a "Orientation Coin" but didn't actually have one for people to print.
This is my version of such a coin. Remember that the filament has 2 sides, so print the coin (if v2, print in vase mode to save time and filament), find the transition points or the most prominent colors and use that to determine how much to rotate your model. It may take some playing around the first time, but after 1-2 attempts you should be aware of the rotation you want to get the color you want.
Once done, you should be able to maintain that orientation for all prints with the filament. I've not found it to shift much (if at all).
Note: this will work with 3+ color filaments too, it was simply made when 2 color was the only option.
Versions:
The author marked this model as their own original creation. Imported from Thingiverse.