I printed the original ducky keycap by Markury and it didn't fit my keyboard, since it's the K55 keycaps. I downloaded 2gifts k55 profile and replaced the base of Markurys with 2gifts K55 base.

You may need to adjust your scale depending how tight of a fit you want. But it fit fine on my corsair. Please also look at the pictures to see how to remove the very small supports on the bottom.