Cannot get BooleanDifference to work

@maxz wrote:

I would appreciate if somebody can take a look at my script and tell me why BooleanDifference is not working .
My script:
#Cut slots from tabs, Max Zuijdendorp, November 2016

import rhinoscriptsyntax as rs

# Check if a layer "Cutting Blocks" exists, if not, add it.
if not rs.IsLayer("Cutting Blocks"):
    rs.AddLayer("Cutting Blocks", (0,255,255))

# Make "Cutting Blocks" the current layer
rs.CurrentLayer("Cutting Blocks")
input0 =()
blocks =()

def cutblocks():

	rs.Command ("_ExtractSrf _Pause")
	rs.Command ("_ExtrudeSrf _BothSides=yes _Solid=yes _DeleteInput=yes 10")
	blocks = rs.LastCreatedObjects()
	rs.SelectObjects (blocks)


def cutting():
	input0 = rs.GetObject("Pick a polysurface to cut from", rs.filter.polysurface)
	if input0:
		input1=blocks
 		rs.BooleanDifference(input0,input1)
		rs.SelectObjects (input0)

more=6
while(more==6):

	cutblocks()
	more=rs.MessageBox("Do you want to cut more slots?",buttons=3)

if (more==7):
	cutting()

This is the test file I am using: Cutting_test.3dm (59.4 KB)

The objective is to cut matching holes in the top polysurface for the tabs of the lower polysurface. I want to allow for slight differences in the height of the tabs, so the method I have chosen is to copy the top surfaces of the tabs, extrude those to a set distance (10 mm) on both sides, and subtract the resulting polysurfaces from the top polysurface.
I have inserted two SelectObjects statements to check visually if all the correct GUI's are being created, which seems to be the case. Nevertheless, I cannot see any holes appearing in the top polysurface.
I have spent the best part of today to get it to work (and re-learning Rhino Python again..), so I would really appreciate some help.

Max.

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