FDM 3D Printer - Fortus 250mc

Quick Links

FDM 3D Printing Guidelines • FDM STL Upload Form  3D Print Queue Public View
 ABS Material Properties • Exporting STL Files from SolidWorksExporting STL Files from CREO
Using Insight to Calculate STL Volume • Using Insight to Scale STL Files
Shapeways.com 3D Printing and Design Tutorials


One of the easiest machines in the lab to use, this Fused Deposition Modeling (FDM) 3D Printer rapidly prototypes parts and even entire assemblies out of white ABS plastic. This is no hobby-grade desktop machine; the Stratasys Fortus 250mc will pleasantly amaze you with its fine resolution, good finish, and strong intra-layer bonds. Thanks to the support material, which provides a foundation for overhanging parts, designers don't need to worry about positive drafts, holes in sidewalls, and other manufacturing details.

How to Start

  1. Read the FDM 3D Printing Guidelines and prepare your design using your prefered 3D Modeling Software (SolidWorks, CREO, Rhino, Alias, Google SketchUp Pro, etc). If you do not have access to a CAD package, consider using one of the free CAD packages like 123D Design, TinkerCad, or the free educational download of Autodesk Inventor. Please note think[box] does not currently offer training on any CAD package, instead it is suggested that you search for online tutorials for your preferred CAD package. Use your home computer, Nord Lab, Reinberger Lab, or another lab on campus to prepare your design.  There are only a small number of computers at think[box], and they are to be used for running machines, not preparing designs.
  2. Using your prefered 3D Modeling Software, export your 3D Model as an STL file.  As a convenience we offer a tutorial for Exporting STL Files From Solidworks, and a tutorial for Exporting STL Files from CREO.
  3. Determine the volume of material (in cubic inches) of your part.  If your software can't do that, then you can download Autodesk Meshmixer for free to calculate your parts volume in cubic inches.
  4. Upload your STL file using our FDM STL Upload Form.
  1. WAIT.  You will receive a confirmation email within 72 hours, to verify your submission was received.  Then, you will receive another email when your part(s) are ready for pickup and payment.  Expected turnaround time is 3-5 working days.  Parts are generally run first-come first-served, however sometimes jobs are run out of order, for a variety of logistical reasons.  Please be patient and wait for the email.m.
  2. Note: All parts will be discarded if they are not picked up within 30 days of receiving a ready for pickup email from think[box] staff.

File Format 

The 3D printer takes STL files, the most common 3D file format.  When exporting STL files from your modeling software, if you get an option to select a resolution, there is no need to go smaller than 0.001 inches.  The resolution of finished parts on the Fortus 250mc is 0.0095 inches, so increasing the STL resolution much beyond this won't result in increased part resolution.


The material used is a proprietary ABS plastic called ABS-Plus P430. Material properties such as Tensile Strength and Flexural Modulus are listed in the material datasheet. Costs are based on the total number of cubic inches of modeling material your part will use, with rates published below (see explanation of pricing rates):

Fortus 250 Material Prices:
Material Slice Height Regular Price* Undergraduate Price
ABS: Ivory 0.013 inches $22.50 per cubic inch $10.00 per cubic inch
ABS: Blue, Red, Yellow, Black ** 0.013 inches $22.50 per cubic inch $10.00 per cubic inch

* Regular price is a guide price only, actual cost may vary depending on complexity of build.  Contact Dr Malcolm Cooke (mnc@case.edu) with questions.

** Colored ABS parts are printed on a machine similar in build quality to the Fortus 250, thanks to a partnership with leading additive manufacturing company rp+m. Lead time for colored parts may be longer than lead time for Ivory parts depending on demand. Maximum dimensions for colored prints are 8 x 8 x 6 inches.

Technical Details

Build envelope (XYZ): 254 x 254 x 305 milimeters (10 x 10 x 12 inches)

Layer thickness is 0.013 inches. Parts are produced within an X-Y accuracy of ± 0.0095 inches, however accuracy is geometry dependent. Achievable accuracy specification derived from statistical data at 95% dimensional yield.