I designed these for my 1 year old grandson who loves knocking things over. They are also good in the bath or a pool.

The ten cups fit inside each other or can stacked about 25 inches tall.

There is one surface on each cup that needs supports. The 3MF is configued to use PLA for the cups, and PETG as the interface material. The combination results in a perfect bottom surface where supports are used.

I sorted them across build plates by color, but you can rearrange them any way you want.

DO NOT put PLA cups into a dishwasher to clean them! They will warp and not fit together again. Scrub them by hand if necessary.

A couple of other good stacking toys for kids can be found here:
[https://makerworld.com/en/models/772492#profileId-708549](https://makerworld.com/en/models/772492#profileId-708549)

[https://makerworld.com/en/models/849508#profileId-797167](https://makerworld.com/en/models/849508#profileId-797167)

I printed both of them and they worked very nicely and were big hits with my grandchildren and friends.