My system is a Dell Precision M4800 w/K2100 nVidia graphics hardware running Manjaro Linux. I'm using FreeCAD for the modeling. Printing is done using PrusaSlicer and a Prusa i3 MKS3 3D printer.
This thread covers making a generic case 100mm x 100mm from PLA with some component holes and inlaid letters. The screen shot below is my current FreeCAD installation (app image):
Click on photos for full size (1920x1080) image.
1) Launch FreeCAD and select file->new
then switch to Model
in the model tree. Also select the Part Design