I designed these to be tight based on my printers' tolerances. I would recommend adjusting the scaling to accomodate your specific printer. Others seem to be having luck scaling up the top portion by 0.5-1.0%

Wanted to create some insulin vial storage that took up less space in the fridge, so set out to design this. Will hold 20 vials of insulin with a fairly small footprint, and collapse smaller when not using the bottom tray.