Undermount Storage Unit

I created this to store extra filament bags but wanted it to be strong enough to hold other stuff too. 

I tested it to 10# and it holds.

I installed with just 4x #6 ½" wood screws but it can take 6. I made a through-hole to install with a screwdriver but I realize this means installation requires at least enough room to fit your screwdriver between the two shelves. 

Printed in ABS but petg would work well too. I think printing this with a filament that has some ‘bounce’ will provide more longevity.