The two vases have a 1 mm clearance.  I vase-mode printed hexagons to fit together and bounce up and down using magnets.   They offer an interesting fidget / conversation piece.  Making them in different colors adds a bit.

The 1.25" magnets are from Amazon at under $6 for 6 pieces.  They come with adhesive stick-ons, so are easy to secure to the vases.  Placing the correct side up is the only challenge.

Guidance for the design is provided by Vladimier Murano, Desktop Makes, under “A Better Way to Make a Hex Vase.”