Macro Solid Sweep

From FreeCAD Documentation

Solid Sweep

Creates a solid by sweeping a profile from a trajectory.

Macro version: 1.0
Last modified: 2011-12-03
FreeCAD version: All
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Author: Normandc
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This macro creates a solid by sweeping a 2D profile along a trajectory previously selected in the 3D view. The 2D elements can be created through the regular tools in FreeCAD's GUI.

It should be noted that the resulting solid will not be parametric. If you decide to change your profile or trajectory, you'll need to run the macro again.

A few examples of sweeping all using the same oblong section and three kinds of trajectory.


  1. Create two 2D elements, one for the section and one for the trajectory, of the types listed below.
  2. Select, either in the Tree view or in the 3D view (The order is important!):
    1. The trajectory
    2. Then the profile
  3. Open the Macro manager
  4. Select the Solid Sweep macro
  5. Click Execute

Result: A Sweep object will be created in the Project tree.

Supported 2D elements


  • The section has to be a closed profile or the result will not be a solid.
  • The section does not need to be located on the trajectory, but it's preferable that it be normal (perpendicular) to the trajectory.
  • The trajectory can either be an open or closed profile (circle, or line and arc segments) but all elements need to be tangent or the resulting shape will be unexpected. For example, a trajectory with straight corners like a rectangle will not produce a solid.
  • If the solid gets twisted, edit the macro to change the isFrenet value to 0 (zero) and try again.
  • Setting the makeSolid variable to 0 (zero) in the macro will produce a set of surfaces with open ends.


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import Part, FreeCAD, math, PartGui, FreeCADGui
from FreeCAD import Base

# get the selected objects, with first selection for the trajectory and second for the section
s = FreeCADGui.Selection.getSelection()
     print "Wrong selection"

traj = Part.Wire([shape1])
section = Part.Wire([shape2])

# create Part objec in the current document

# variable makeSolid = 1 to create solid, 0 to create surfaces
makeSolid = True #1
isFrenet = True #1

# create a 3D shape and assigh it to the current document
Sweep = Part.Wire(traj).makePipeShell([section],makeSolid,isFrenet)
myObject.Shape = Sweep


Thanks to Wmayer for his help in writing this script.

Two examples of uses can be found in this forum topic, along with download links to the FCStd files. Using a helix as trajectory, a solid sweep can be used to create a bolt thread.