Create Struts

Create struts using a point-to-point selection. Struts can be created outside of stacking if applied within a single part. The following keyboard shortcuts will be useful when creating struts:

ctrl+click Prevents selection of existing strut points. Also creates a strut on an existing strut.
spacebar Apply strut (set button)
delete/backspace Delete selected strut
C Clear struts selection
A Select all (useful for modifying parameters on all struts)
ctrl+Z/Ctrl+Y undo/redo

Creating Struts Workflow for Industrial Stacked Printing

  1. In the Print module, click Create Struts.

  2. Change options and parameters as desired.

  3. Click on two points between the first and second row of parts to create a new strut between them.

NOTE: Once two points are defined on a model, the preview of a strut appears. You can edit the previewed strut by clicking and dragging one of the end points of the strut or by clicking on a new position.

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  1. Press the Spacebar or click Apply to create a strut on the model. You can now add a strut using one of the following methods:
    1. Click two points on a model.
    2. Click a point on an existing strut, and then click a point on the model.
    3. Click points between two existing struts.
    4. Click two points between two different parts (only available in stacked printing).
  1. Use Ctrl + Click to set the start point of a new strut on the existing strut, and then click on a point on the part.
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  1. Press the Spacebar or click Apply to add a new strut.
    1. If necessary, you can delete the created strut by clicking or lasso-dragging and pressing the DEL key.

    2. The committed struts are used as auxiliary components of the model, similar to supports.

  2. Repeat until parts are adequately supported.

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Criteria for Adding Struts

  1. Add struts between the first and second row of parts.
    1. To reduce material usage, make use of creating struts off other struts like a tree branch.

    2. Keep an eye on your struts and make sure they are self-supporting. If they are close to horizontal, make sure they have additional struts connected to it to make sure it prints.

    3. Make sure that struts do not accidentally intersect your part.

  1. Add struts within parts
    1. Take note of your critical features. With struts, support scarring is minimal and normal to surface.

    2. If Down Face coloring is turned on (40° angle and 10 grades), you can determine what sections of a part might need some struts in order to print.

    3. You can use the Z-Clipping tool and drag it across the part to check for islands that will need supports. Make sure to add struts to those islands. 

  1. Add struts between columns.
    1. Make use of triangular geometry to stiffen up strut structures.


  1. Use default settings for optimal strength and minimal support scarring. Edit parameters for optimization in a production setting.
  2. Strut parameters may need to be adjusted for certain materials. Softer materials might need more struts.
  3. Can reduce strut width or add a center taper to use less material.


  1. When creating struts, it is helpful to create trusses with the struts to add rigidity to a structure for cleaning and handling during post-processing. Triangles are very helpful; and it is good to check that the angle of the struts are self-supporting - 40-90° from the horizontal should be fairly self-supporting. Check down face under Shading in the View tab.
    • You cannot create struts between two bases.
    • You cannot create struts between the first row of part and a base that is not directly below a column/part.
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In 3D Sprint, click the ? button in the Create Struts dialog to see complete information about strut functionality.