3D Printer Extruder Support Example Broken In CQ 2.0

It looks like this example was broken in the transition to PythonOCC. It fails in both CQ-editor and the jupyter_cadquery extension. Here's a jupyter_lab stack trace from this issue: https://github.com/bernhard-42/jupyter-cadquery/pull/8

IndexError                                Traceback (most recent call last)
<ipython-input-1-5f4eaaefbfe8> in <module>
    141 # add reinforcement holes
    142 cutout_rad -= 2*cutout_offset
--> 143 res = res.faces('>Z').workplane().\
    144           pushPoints([(-cutout_rad, -main_plate_thickness/4),
    145                       (cutout_rad, -main_plate_thickness/4)]).\
...
IndexError: list index out of range