Here is a case to hold a Merkur classic safety razor, up to 10 extra blades and act as a razor stand with pockets to stand up the blade guard and cap for drying after your shave. This case is modeled to accept razors with a blade guard that is 1.700" x 1.06" or smaller with a max handle diameter of .460". The length of the assembled razor needs to be 3.40" or less from base of handle to the top of the cap to fit in this case. The case lid and base gaps are all modeled at .010" clearances, so your printer needs to be able to hold +/-.005" for it to fit together. The overall assembled case dimensions are 1.19" x 2.43" x 3.63". If you are wondering why I made windows, it is so there isn't any condensation build-up in case you need to put it away wet.
Edit 3/5/2018: Added Kronos R1 case that clears a 1/2" dia handle and 3.88" assembled length razor.
Edit 7/16/2016: Added a v1.1 to address the hinge fitting issues.
Edit 7/17/2016: Added a solid lid if you don't want the windows.
The stl's import as I printed them with the large bases against the build plate.