import cadquery as cq

slant_degree=15.0
thickness=20
stepper_motor_size=42
offset=8.83

base = cq.Workplane('XY').lineTo(0,offset).polarLine(42 ,90-slant_degree).hLine(43.4816).polarLine(45,270-slant_degree).polarLine(10,-(90-2*slant_degree))
base = base.threePointArc((50,-20), (25, -30)).polarLine(10, 180-slant_degree).vLine(10).polarLine(12.5, -slant_degree)
base = base.threePointArc((35, -20), (25, 0)).polarLine(10, 180-slant_degree).close().extrude(20)

# Render
show_object(base)