I just received my fourth rack from Animal Plastics. It's their hatchling rack that uses the sterilite 1752 boxes. 9 shelves, 3 boxes per shelf, for a total of 27 boxes. The boxes fit very tight. The gap between the top of each box and the shelf above it is very small. So small that even the tiniest hatchling could not escape. Yet, every box slides in and out very easy. No binding, no spilled water bowls, no issues due to a sagging shelf, etc. It's amazing that the fit is so tight and precise and yet the boxes do not bind. The rest of the rack is typical AP. Attention to detail, very rigid left to right and front to back, indirect belly heat using heat cable so there's no problem getting the higher temps required for balls, etc. I'm completely satisfied with how this rack works and just as impressed with it as my other 3 racks from AP. I highly recommend the racks from Animal Plastics.
John Q