I modified this part. The STL file for printing is here.
I scanned my calculator.
deleted the screen and stretched the model in the z direction
Useful Rhino Commands for 3d Printing
drapept meshfrompoints meshtonurbs meshsplit mesh checkmesh unifymeshnormals rebuildmesh reducemesh
printed the model
Next time, I'm going to scan the printed model before the wax is removed.