Adjusting FDM print settings

The available settings depend on the  printer model, the material selected, and the file format of the selected model. Settings dependent on file format and material will be noted in their descriptions, but the settings dependent on printer are split into Basic and Advanced sections below. 

Basic Settings

These settings are available for all supported FDM printers. For uPrint and Dimension printers, only these basic settings are available, but for other printers, advanced settings are also available. Jump to section.

Tray Settings

These properties must be the same for all models on a tray. When you select a real printer and not a template printer, the settings from the printer will fill the values here, and a green icon will indicate that the settings match those of the printer. 

Slice Height

The available options for slice height depend on the selected printer. To learn more about slice heights,  read more here

Model Material and Support Material

Consult for more information on materials available for your printer.

Model and Support Tip

Some printers require different tips for certain print settings. 

Model Settings

These properties can be changed for individual parts on the tray. Select models with left-click, either in the 3D viewer or the models list in the Project Panel. Add to your selection with ctrl+click.

Part Fill Style

To learn about the different styles, read more here

Support Settings

Support Style

To learn about the different styles, read more here

Use Model Material

This allows the support structure to be printed using mostly model material, with a few layers of support material where the support structure meets the model. This reduces the amount of time the job spends switching between support and model material each layer. 

An additional checkbox changes the infill of the generated support structure to be higher density and without a boundary contour. 

Grow Supports

Grow Supports improves the stability of supports by creating increasingly wider supports further below the model. However, this may create unneeded supports for some models, such as in the example pictured below. 

Do Not Grow Supports Grow Small Supports Only

Self-supporting Angle

Supports are generated wherever the angle of the part surface drops below a specified value, known as the self-supporting angle, and it can be adjusted here. You can increase or decrease the amount of supports that are generated, and also restore the value to the default recommendation, which varies for different printers and materials. 

Advanced Settings

These settings are available only for the Fortus, F123 Series, and F900 printers unless otherwise noted.

Tray Settings

Slice Style (Fortus 900mc, Fortus 450mc, F900, F370 and F270 only)

Set how the slice height is applied to the model.  Constant uses a single slice height for the entire model.  Adaptive uses the selected slice height for features that require more detail like domes, fillets, and chamfers, and a thicker slice for features where detail is not needed, like vertical walls. This feature is available for nominal slice heights  0.010 inch (0.2540 mm) or 0.007 inch (0.1778 mm). 

Selected Slice Height Additional Slice Height
0.0070 inch (0.1778 mm) 0.0100 inch (0.2540 mm) 
0.0100 inch (0.2540 mm)  0.0130 inch (0.3302 mm) 

Note: Adaptive Slice Style is only available when only one model is active on the tray.

Part Build Style (F123 Series only)

These are like presets. Build Styles other than Normal will apply certain model and tray settings as well as change the way the printer operates for this job. 

Normal — No preset; fully user-defined. Available for all materials except PLA, and required for F123 TPU 92A and F123 Diran 410MF07.
Draft Mode — Uses sparse fill with less support to increase throughput and improve manual support removal. These settings significantly increase job throughput. Some support settings may be changed, however this is not recommended. Available for all materials except F123 TPU 92A and F123 Diran 410MF07, and required for PLA. 

Purge Part Type / Sacrificial Tower Type

F123 Series printers use a purge part on the tray instead of a purge bucket behind the tray. This reduces head movement per layer, reducing print time. Purging is needed when the printer swaps from printing model to support material in each layer. For Fortus printers, you may want to add a sacrificial tower, even though material is already purged into the purge bucket. The seam quality is often lowest on the first part after the purge, so introducing a sacrificial tower to the tray will make sure the seam quality is consistent for all parts on the tray. This helps especially for Nylon materials, and is required for printing with Nylon 12 CF. 

Often, the upper layers of a print will not use any support material, so purging is not required. This setting adjusts the height of the purge part. In model view, the purge part on the tray will always display as "Full Height" regardless of your setting, but if you go to Slice Preview you can see the actual height. 

Last Swap — The purge part will only be as tall as the last layer of support material
Full Height — The purge part will go all the way to the last layer of model material. 

Note: If you have selected PLA as your material, there is no purge part, since support material is not used. 

System Mode (F123 Series only)

Normal — Acceptable for most part printing.
Brick Mode — Helpful when printing large parts to reduce part curl. This is only when using a slice height of 0.005” with ABS, ASA or PC-ABS.

First Layer Material (F123 Series only)

When 0.005" slice height is selected, you can choose whether to use support or model material for the base layer that makes contact with the tray. This slice height uses a lower chamber temperature, and to improve tray adhesion and ensure part quality, model material is the default selection. However, when you want your part to be easy to remove from the tray, you can use support material for the base layer. You can also use this in conjunction with Brick Mode (see above) to raise the chamber temperature.

Model Settings

Advanced settings may be applied at the body or face level, depending on the type of file selected. Toggle between body and face selection with the tabs in the Model Settings panel, or by hitting the B or F key while the Model Settings panel is open.

Body Settings

Group Behavior

When applying body settings to an assembly, more options are available once you create a Group. After adding an assembly file or multi-body part file to the tray, select either the top-level assembly or a few components that you want to print, and create the Group by hitting the button in the project panel or the right-click menu. The Group is a flat assembly structure consisting of only the selected components, and the original assembly is hidden. When you select the Group in the file list, the Group Behavior setting is shown in the Model Settings panel.

Separate Bodies — Each component can have its own body setting. This is the default setting when you create a Group.
Combine Bodies — One body setting applies to the whole Group. This is also the behavior for an assembly if you do not create a Group. 

Printing a Group with the Separate Bodies behavior allows you to optimize the physical properties of the printed part. For instance, some areas can be printed with solid infill for strength, while others can be sparse to save weight. Define these regions during the design of your model in your CAD system. 

Infill Density

Some infill styles allow for the density to be controlled. Increasing the density reduces the gap between infill rasters for greater strength, and decreasing the density moves the rasters farther apart, decreasing material usage and print time. 

Body Thickness

This setting controls the infill near the surface of your model. Increasing the thickness increases the number of contours around vertical surfaces and the number of solid layers around horizontal surfaces. 

Infill Angle

Adjust the angle of the infill rasters to better align with the geometry of your part.

Thicken Thin Walls

When the model is sliced, some areas of the slice may be narrower than two toolpath widths (four times the slice height). With this setting enabled, narrow areas will be thickened to the minimum wall width. If this setting is disabled, toolpaths will not be generated where they do not fit. If the setting is not available, it is on by default.

Off On

Variable Width Fill

Designed to give better fill in small gaps where a nominal width toolpath would not fit.

Off On

Face Settings

Depending on the file type of the selected model(s), you may be able to apply settings at the face level. Face settings are only available for file types that contain BREP geometry. Mesh-only formats (.stl, .wrl, .obj, and .3mf) do not contain precise BREP geometry, so face selection is not available. Native CAD formats like .sldprt, as well as some interchange formats like .stp and .igs, all contain BREP geometry, so both body and face selection are available. Additionally, face settings cannot be applied to ungrouped assemblies, or groups with the Combine Bodies behavior selected.

Apply Insert

Because it isn't advisable to 3D print a thread, you may want to use a metal insert after your print is completed. The Apply Insert feature ensures that the printed part has the proper hole dimensions to receive it. Select a hole (cylindrical face), and then check the Apply Insert checkbox. Choose the type of insert (tapered heat set or Helicoil) and size, and the recommended hole dimensions shown will be applied to the selection. 

If the hole dimensions don't match the recommendation for your insert, you can select Custom and input your own dimensions. Clicking "Save Custom Size" will add it to "My Library." If you have many insert dimensions to add, you can create a custom library file and add it using File > Preferences > FDM. The file must be a .JSON text file and have the following format:

  "version": "1.0",
  "name": "Custom Library 1234",
  "libraryType": "insert",
  "entries": [
      "version": "1.0",
      "name": "MyInsert 1",
      "type": "insert",
      "content": {
        "name": "MyInsert 1",
        "diameter": 0.2,
        "thickness": 0.2,
        "units": "in"
      "version": "1.0",
      "name": "MyInsert 2",
      "type": "insert",
      "content": {
        "name": "MyInsert 2",
        "diameter": 0.4,
        "thickness": 0.2,
        "units": "in"
Make Self-Supporting

If you have holes in your geometry that will print horizontally, this feature will change them to a diamond shape so that they don't require support material.

Avoid Seams

Each toolpath's end point leaves a small irregularity in the surface, usually on an edge. If a particular surface's shape is crucial, you can select it and apply this feature to prevent the toolpath from ending on it or any of the surrounding edges. 

Surface Thickness

Similar to the thickness control for bodies, but applied to a particular face. 

Support Setting

Currently there are no advanced support settings. See the basic section above.

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