Two marbles puzzle

This is a print in place puzzle with two marbles (glass marble, plastic marble, iron marble, ...).
The challenge is to put the 2 marbles on each of the 2 horizontal platforms.

**ACCESSORIES**
. 2 marbles with a diameter between 16mm and 18mm.

**PRINTING**
How to insert marbles :
. Pause the print at a height of 59mm
. At the pause, insert 2 marbles and restart printing

An other version with acrylic plates : https://www.thingiverse.com/thing:7010049