Prints nicely without supports. Room for magnets in the base.
Mine are printed with 0.2 layer height and 10% infill. Basically do as you normally do, and it should be fine. 

The 1x1 holder pairs nicely with [https://www.printables.com/model/579203-gridfinity-1x1-belt-loop-magnetic-baseplate](https://www.printables.com/model/579203-gridfinity-1x1-belt-loop-magnetic-baseplate) for when you are on the go. Just make sure to stay upright, so they don't fall out.

Can also print two 1x1 and use the second for storing tips. They stack just fine.

The large tips fits into the holder when placed upside down, but there wasn't enough room to get them placed correctly.