This ball maze is a single, solid print. You have to solve it blind.

The original size was designed for a .375 dia ball or smaller. 2.5L x 2.5W x .75H
The smaller one scaled to 60% works for .187 dia ball or smaller. 1.5L x 1.5W x .45H

The maze is more challenging if you start in the hole with the raised edge.