UPDATE: You certainly want the new krab-stand* version which has only positives and none of the negatives mentioned below. Print them all at once, perfectly! Shape is slightly improved for printing in the standing position.

Bowls are carefully optimized for two things you do when working with beads:

• picking individual beads by hand (bottom edge is rounded)
• pouring the beads back into a tiny bag (small angle smooth corners)

The six bowls stack neatly to save you space when stored.

We did a lot of experiments pouring beads into small bags to make the bowls form perfect :) This led us to rather extreme overhangs at corners. It still prints just fine and looks nice from the top but the bottom side of corners will likely print much less smooth than the rest. If you are a perfectionist printing this as a present for your even more perfectionist girl friend, you may try to fiddle with temperature, materials and supports. (Update: Not anymore. See above.) If you just want to use these, print in PETG with thin layers and no supports and give some corners a few file strokes.

All the six bowls have the same stl shape, just printed at 60, 68, 76, 84, 92 and 100%.

The provided FreeCAD design file uses the Pyramids-and-Polyhedrons workbench (install it from Tools / Addon manager). There is a Pyramid part at the bottom of the hierarchy, changing the Radius1 and Radius2 should work to some extent if you want to find your own optimum between beads pourability and overhang printability.