smpsbox.py

import cadquery as cq
import math

# shell thickness
th = 1.5
# shell fillet radius
fillet_r = 1.5

centerXY = (True, True, False)

width = 30
height = 20
length = 90

# make shell
result = (cq.Workplane("XY")
          .box(length, width, height)
          .faces(">Z")
          .shell(-th)
          .edges("<Z or |Z").fillet(fillet_r)
          )

result.faces("<X").workplane(centerOption="CenterOfMass", 
                             invert=True).tag("end1")
result.faces(">X").workplane(centerOption="CenterOfMass", 
                             invert=True).tag("end2")

# DC socket hole
result = (result
          .workplaneFromTagged("end1")
          .circle(4)
          .cutBlind(10)
          )

# wire hole
result = (result
          .workplaneFromTagged("end2")
          .slot2D(4.5, 2.5)
          .cutBlind(10)
          )

show_object(result)