IKEA ENHET end stop bathroom cabinet

I've been having issues with my IKEA ENHET cabinet mounted right above my toilet. Since it is not very deep, often things would fall out, sometimes into the toilet. To prevent this from happening, I designed this end stop to keep things from falling out. 

It's printed on my MK4, layer height is 0.2mm, IS SPEED. 

For the 60cm cabinet, you need 3 units for each shelf, for the 40cm cabinet you need 2.