Is the Simplify3D Software Cross-Platform?
Yes. The software supports Windows, Mac, and Linux operating systems.
Unidentified Developer Warning when Installing the Software on Mac OS X
If you see this message on Mac OS X 10.8+, simply right-click on the installer and choose Open. At that point, you will be asked if you still want to open the installer even though it is from an unidentified developer. Click Open and you can proceed with the installation as normal.
What File Formats does the Simplify3D Software Support?
The software currently supports the 2 most common 3D printing file formats: STL and OBJ files. STL is the most common (and recommended) while OBJ is used more for graphic design. Thingiverse typically uses .stl files and virtually every CAD program is capable of outputting to this format (although some packages such as Google Sketchup may require an additional plugin).
How Do I Zoom, Pan, or Rotate the View?
Rotate the scene using your left mouse button. Panning is performed using the right mouse button. Zooming is controlled using the mouse scroll wheel (or two-finger gestures if your device supports it). For those without a mouse wheel or multi-touch support, you can also zoom using Shift-Left-Click. Pro tip: Use the middle mouse button to snap back to the default view.
How Do I Move, Rotate, and Scale My 3D Model?
First, ensure that the model you want to use is selected. You can do this by clicking it on the screen. The model should change color to indicate that it is selected. Once you have selected the model, simply Ctrl-left-click (or Command-left-click on a Mac) and drag to move the model on the virtual build table. Use Ctrl-right-click (or Command-right-click) to scale the model by moving the mouse up and down. You can also rotate the model using Alt-left-click and dragging side to side. Pro tip: Double click on a model to open its custom positioning window if you want to enter exact numerical values.
My Machine has a Different Coordinate System or is Oriented Differently
The software is setup to accomodate as many different configurations as possible. You can modify these settings by going to Tools > Options (or Simplify3D > Preferences on a Mac). Flip the directions of the 3 coordinate axes until the virtual build table matches the setup your machine is using. If you notice that your models are flipped and are printing in reverse, it is likely that you need to update these settings.
Can I Slice Multiple Models at Once?
You can slice as many models as you want using the software! Just import all of the models you want to slice onto the virtual build table and then position them as you wish. Pro tip: Use the “Arrange” button to automatically center and position all of your imported models for printing.
How Do I Choose What Models are Sliced by a Process?
Double click on your process and choose “Select Models”. Simply click and highlight the models you want to slice with the current process or choose Select All to choose all currently imported models. Pro tip: If you add your process AFTER you have already imported all of your 3D models, the process will automatically apply to all of the visible models on the virtual build table.
Does the Software Support Multiple Extruders?
If you’re lucky enough to have multiple extruders on your machine, our software can help you make the most of them! We support as many extruders as you want and you can easily use different extruders for the outline, infill, or support structures. Try printing your support structures in a dissolvable material like PVA or use a second extruder with a larger nozzle to print part interiors quicker than ever!
What is a .Factory File?
Factory files are the method used by Simplify3D to package everything you need to re-create your current session. We save the 3D models, placement details, manually placed support material, and build operations all to a single file. And better yet, we use a great compression method to save space on your hard drive! A .factory file is a great way to share builds between people who have similar printers. You could even save an entire project with several models, multiple build platters, and different slicing settings all to a single location. Imagine handing someone a single file that contained everything needed to print a complete Reprap Mendel kit!
I’m Having Issues with the Previewer Running Out of Memory
For extremely large models, the G-Code preview may have several million movements to render! If you have limited hardware this could be an issue. We provide 2 methods for previewing your G-Code instructions to alleviate this problem. The High Detail option creates the most realistic looking previews, but can be fairly memory intensive for large models. The Low Detail option has a significantly reduced memory footprint that may be useful if your computer was running out of memory or crashing with large G-Code previews. You can change this setting by going to Tools > Options (or Simplify3D > Preferences on a Mac) prior to previewing the file.
I’m Having Errors When I Slice My Models
If you’re running into slicing errors or your G-Code previews don’t look correct, the first place to look is the original 3D model itself. Use the repair menu to look for any non-manifold segments or look at your model with a wireframe view to ensure there isn’t anything fishy going on with the triangles that define the part. For more information, please see our Identifying and Repairing Common Mesh Errors tutorial.
Will the Software Ever Modify My STL Files
The software will never modify your original STL files. All transformations and manipulations are done in memory. If you want to save the modified model as a new STL file you can always use the File > Export menu option.
How do I receive my software?
Simplify3D Software is an electronic download. Following your purchase, a verification email will be sent to you from You can follow the instructions in this email to download and install the software. If you do not see this e-mail within an hour, please check your spam folders. Contact us if you need additional help locating the verification email.
What operating systems are compatible with Simplify3D?
The software is cross-platform and can be installed on Windows, Mac OS X, or Linux systems.
What are the system requirements?
System Requirements: Intel Pentium 4 or higher processor, 2GB or more of RAM. Windows XP or greater, Mac OS X 10.6 or greater, Ubuntu Linux 12.10 or greater. OpenGL 2.0 capable system.  An internet connection is required for the installation and continued use of the software.
How will I obtain software updates?
The software already includes an automatic update utility that will alert you when new software updates are available. In addition, your name and email address will allow us to stay in touch concerning the latest news and software releases.
I’m having problems slicing models with very thin exterior walls and details
The first place to investigate is to compare your extrusion width setting to the size of your model. In order for the software to slice your model, your extrusion width setting needs to be smaller than the model dimension. For example, if the wall of your model is .35mm thick and you have the extrusion width set at .40mm, the extrusion is actually larger than your model. This will cause slicing problems because the software is attempting to place the line of filament "inside" the dimension of your model. When the extrusion width is too large, the filament will be forced "outside" the model dimension. Therefore, the model will not slice properly and your model will will have holes in the Previewer. To resolve this, there are two methods- you can decrease the extrusion width or make your model larger. If you cannot change the size of the model, try reducing the extrusion width. For example, on the .35mm thick model described above, reduce the extrusion width from .4mm to .3mm and the model will slice perfectly. Note, the extruder head will have trouble printing an extrusion width smaller than the nozzle diameter so try to keep the extrusion width setting within a close range of your extruder nozzle diameter for optimal print quality.
How does fine exterior and sparse infill work? I’ve exceeded the 1.2 ratio.
Sparse infillSimplify3D allows you to print a fine perimeter layer height along with a thicker infill. You'll find 'Print Sparse Infill Every __ Layer(s)' in the 'Infill' tab.  Use this setting to achieve a high quality exterior while saving time printing the infill.

The 'Sparse Infill" value you enter is related to your 'Primary Layer Height' (layer tab). The perimeter will print at your 'Primary Layer Height', and then the software will multiply the primary height by __ (the number you enter) when printing your sparse infill layers. For example, if you have a primary layer height of 0.1500 mm and set the Sparse Infill value to 2, your infill will print at 0.3000 mm (0.1500 x 2).

For proper adhesion of layers, the software will not allow you to exceed a 1.2 ratio of width to thickness.  If you exceed this ratio, Simplify3D will warn you. If you get the warning, try reducing the exterior layer height.

Additional examples:
  • 0.1 mm fine exterior height - sparse infill can print every 2 or 3 layers
  • 0.15mm fine exterior height - sparse infill can print every 2 layers
  • 0.2 mm medium exterior height - sparse infill not suggested at medium or draft exterior levels

There is a similar Sparse Infill setting under 'Support' which works in the same way to create a sparse infill in your support structures.
What if I have multiple computers?
If your license is for individual use, you may install the software on up to 2 devices that you personally own and use. For example, if you had a laptop and a desktop, you could use the software on both computers at the same time. If you ever need to move you license to a different computer, simply uninstall the software from the old computer to remove your license from that machine.