Lego sieve for sorting small pieces

Simple sieve to sort small Lego bricks. Just put the bricks in, shake and it's sorted. More details including the generation code at:
https://www.brickodyssey.com/3d-printing-lego-sieves/

Update 2016-04-26:
This includes 3 sieves with different sizes: 18 mm, 14 mm and 10 mm.

Update 2018-08-17:
Added the 22 mm filter as well as larger version for larger printers (30 cm vs 20 cm)