I wanted to add some color to my bike, so whipped up these end caps and printed them in lime green. The end caps fit in to standard drop bars (road or cyclocross bikes), and will hold your bar tape snugly in place.
I modeled these based loosely on the existing caps I had but then cleaned them up for 3D printing. I recommend using supports just so the little sticking out bits on the sides print nicely. But not required.
I used high infill so they'd be strong enough to hold the bar tap in place, and so the fit was snug.