This is a tweak on ALR's excellent design so you don't need to buy new bolts but can use the bolts already in the Pixie Nespresso machine. It's otherwise the same, you slide capsules to the top where it's a little wider so you can get them out. Holds 12.

As you'll see in the comments folks raised valid concerns which are addressed in the 2.0 file. I leave the first file as it's the one I printed but the second file is designed to offer better printability and strength.