Modular Marble Run

This is a modular marble run I created using tinkercad after seeing a similar one somewhere on the internet.. I thought I can make one myself using a 3d printer..I design the cube to be the main structure to hold on to the tracks so you can make whatever design you'd like..i use 5mm magnetic balls that is inserted into the cube frames to help snap the cubes together when assembling any design for the tracks..you could also use clips i design to hold the cubes together if you dont want to use the