Tray with compartments sized for storing M3 or similar screws, designed to be printed with a 0.4mm extrusion width (dividers are 0.8mm thick).  Dimensions are 125mm x 125mm x 16mm without lid.  You can of course scale it to any size you want, but you may want to scale the extrusion width to match.  
Another option for storing smaller quantities of screws is a customized version of the compartment case.  
If you're in the US and need metric or stainless steel hardware, Trimcraft Aviation RC has the best prices I've seen and they have a good selection is sizes useful for 3D printers.  Shipping is only $3.  BoltDepot is a good option for sizes not available at Trimcraft.  You can order in any quantity, but they're usually more expensive.  
Printer: RigidBot
Filaments: (full list can be found on thrinter.com)
-- 3D Supply Source Transparent Orange PLA