as mentioned it is a trash can. 

For use you need 2  14mmx4mmx2,5mm magnets.  If you dont have them you can adjust the step model for your needs.  

Slide the magnets in the two holes.

You slide the can from above onto the bolts of the left z axis motor; pull to remove it. 

The can is designd so the top of the can is on one level with the bed an the bottom on one level with the bottom of the printer. 

The advantage of this design compared to others is that the airflow for the electronics isnt blocked.