cadquery layer cake example of unwanted changes

layer_cake.png

layer_cake.py

import cadquery
from Helpers import show

# Layer Cake
#   build layer cake by creating the base,
#   then build on top of the base while retaining the base information

base = cadquery.Workplane('XY').circle(30).extrude(10)
cake = base.faces(">Z").workplane() \
    .circle(20).extrude(10) \
    .faces(">Z").workplane() \
    .circle(10).extrude(10)

# base is expected to be just the first layer
# base is actually the first 2 layer
show(base)

# cake is as expected; all 3 layers
show(cake, (200, 200, 200, 0.8))