Macro 3d Printer Slicer Individual Parts

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Macro 3d Printer Slicer Individual Parts.svg Macro 3d Printer Slicer Individual Parts

Export to slicing software for 3D printers based on a similar macro by cae2100. Exports a single stl file for each visible part in the same directory as original design file, then opens it in slicing software.
This code, when run, will export the currently open design to several STL files, named after the labels of the parts, and open it in the slicing software that you use. The macro is searching for Cura in the path but you can add any other slicing by changing the string in the macro.

Macro version: 1.1
Last modified: 2020-10-30
FreeCAD version: All
Download: ToolBar Icon
Author: WayofWood
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Macro Version
Date last modified
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Macro 3d Printer Slicer Macro 3d Printer Slicer.png


This code, when run, will export the visible bodies at the top level (bodies deeper in the tree will be ignored) of the currently open design to individual STL files, and open them it in the slicing software that you use. This macro will look for Cura as the default but you can change it to any other slider by changing the SLICERAPP variable in the source code.

It is best used by creating a link to the macro on the toolbar, and when your ready to slice the object, just click it and your objects, as they appear on the screen in FreeCAD will appear on your slicing software's interface, ready to slice. It will also create several STL files with the same filename as the design file and the part label in the same directory as the design file.

Screenshot Cura Example.png


The SLICERAPP variable can be changed to any slicing software of your choosing. If a specific object is not exported you might have to add the respective type to the doexport array.

ToolBar Icon Macro 3d Printer Slicer Individual Parts.svg

import FreeCAD
import Mesh
import sys
import math
import os
import subprocess

SLICERAPP= "cura"		 			# Put your Slicer program here

# some fuctions
def getPlacement(quat,vect,obj):
  if quat[3] > -1  and quat[3] < 1:
    delta = math.acos(quat[3])*2.0
    scale = math.sin(delta/2)
    rx = quat[0]/scale
    ry = quat[1]/scale
    rz = quat[2]/scale
    delta = 0
    rx = 0
    ry = 0
    rz = 1
  info0 = "translation "+str(vect.x)+" "+str(vect.y)+" "+str(vect.z)
  info1 = "rotation "+str(rx)+" "+str(ry)+" "+str(rz)+" "+str(delta)
  return info0+" "+info1
# some definitions
placement = App.Placement(App.Vector(0,0,0),App.Rotation(0,0,0,1))
# user need to set this directory where slicing software is located
OutDir = FreeCAD.ActiveDocument.FileName.replace(".FCStd", "--")
visible_objs = []
# Get Objects in document
doc = App.ActiveDocument
objs = doc.Objects
stlFile = ""
stlFiles = [ SLICERAPP ]
# hide all
for obj in objs:
   print(obj.Label + "//" + obj.TypeId)
   if obj.ViewObject.isVisible() and hasattr(obj, 'Shape') and (len(obj.InList) <= 1):
for obj in visible_objs:
  # get volume
  volume = obj.Shape.Volume
  # get Rotation and translation of volume
  quat = obj.Placement.Rotation.Q
  vect = obj.Placement.Base
  pinfo = getPlacement(quat,vect,obj)
  # reset placement, export it and set at original placement
  oldPlacement = obj.Placement
  obj.Placement = placement
  obj.Placement = oldPlacement   
  stlFile = OutDir+str(obj.Label)+".stl"
  print ("Exporting " + stlFile + "\n")
print ("Calling subprocess: " + str(stlFiles)+"\n")


Thanks to cae2100 for developing the original macro code - also available here.
Thanks to Wmayer for his help in writing this script.
Original forum topic: