This design allows you to create your own n x m drawer for the Ultimate Drawer System by MarcElbichon.
Use the FreeCAD file (.fcstd) and open the settings-spreadsheet and set the number of columns and rows.
Edited 20170926: Now the U height parameter for 1U, 2U ... height can be set to within the settings-spreadsheet.
My print settings:
0.3mm layer height
105% filament speed