This is a Multiboard snap that provides a Tentacle System base. It prints without supports.

The Tentacle System allows you to create ad hoc stands and holders using a variety of connectors and grippers. This part lets you attach those ad hoc stands to a Multiboard.

This model incorporates the basic snap created by Keep Making, which can be found here.

You can learn all about the Multiboard here: https://www.multiboard.io/

You can learn all about the Tentacle System here: https://3ddoodle.com/tentacle-system/