Cura projecting floating print onto build plate during slicing

Question

I'm trying to do a multifilament print on my single extruder machine. So I separated out the models based on filament, and imported the parts into Cura. I ensured that "Automatically drop models to build plate" was disabled and in the "Prepare" phase that seems to work. However, when I slice the model it gets pushed back down to the build plate as can be seen in the picture below. Any recommendations? Do I just need to write a script to go in and shift the z location?

score 2 · Accepted Answer · answered Feb 22 '20 at 06:03

I've been playing with this and came up with a solution, so I thought I would share in case anyone else had this issue in the future. In Ultimaker Cura I enabled supports and z-hopping before I sliced the part, then I ran this Python function to remove the supports and get the extruder setup.

import re

def float_part(file):
    printString = ';LAYER:'
    partString = ';(.*?).stl'

    with open( file , 'r') as content_file:
        content = content_file.read()

    printArea = re.search( printString , content ).span(0)[0]
    partArea = re.search( partString , content ).span(0)[0]


    uncommentedLine = partArea - re.search( '\n.*?(?<!;)\n' , content[ partArea:printArea:-1 ] ).span(0)[0]

    lastExtrusion = uncommentedLine - re.search( 'E' , content[ uncommentedLine:printArea:-1 ] ).span(0)[0]
    secondLastExtrusion = lastExtrusion - re.search( 'E' , content[ lastExtrusion-1:printArea:-1 ] ).span(0)[0]

    lastExtrusionAmount = float(re.search( '\d+(\.\d+)?', content[lastExtrusion:] ).group(0))
    secondLastExtrusionAmount = float(re.search( '\d+(\.\d+)?', content[secondLastExtrusion:] ).group(0))

    ResetCommand = '\nG92 E' + str(lastExtrusionAmount) + '\n'

    with open( file , 'w') as content_file:
        content_file.write( content[0:printArea] + ResetCommand + content[uncommentedLine:] )

Cura projecting floating print onto build plate during slicing

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