This Kitronik University resource is part of the BBC micro:bit partnership and features FREE downloadable bbc micro:bit CAD resources.
The bbc micro:bit CAD resources:
The team here at Kitronik have created a CAD model of the BBC micro:bit. We use these models to produce many of the resources we create for the BBC microbit. We’ve put up these models for you to use free of charge for your own designs and renders. Students and teachers (and home users) alike are sure to find them a good starting point for projects based around the BBB micro:bit. The files are available in the following formats (see bottom of page for download links):
- .iges
- .stl (which can be used in most CAD programs and for 3D printers)
- .sat
- .obj
This render was created to show the kind of images the files could be used to create. 
Autodesk – FREE Educational Design Software
To use these files you will need some CAD software. Autodesk provides their professional software free of charge to Education and Home user which makes it an ideal choice. Autodesk gave the following reason for providing such easy access to its products:
*’Closing the skills gap starts in education. Autodesk is tackling this by providing schools with common access to the same advanced technology being used by industry professionals today. Autodesk provides schools, students and teachers with free access to its professional 3D design software. This will enable educators to introduce design thinking into our classrooms allowing students to imagine, design and create a better world. Using these tools to learn how to solve real-world challenges in new creative ways will be the perfect preparation for our next-generation workforce. Equipping them with 21st-century skills to meet industry demands and advance economies worldwide.’*
For more information, click here. 
How Kitronik Are Using The BBC microbit Design
We’re using this design to create new resources which we thought you’d find useful. One example is this poster highlighting the features of the BBC micro:bit (PDF download available below): 
Also, another is this useful mechanical datasheet (download available below): 
Using The Files When Creating 3D Printed Case Designs
Having the BBC micro:bit as a CAD object is incredibly useful when creating 3D printable (or laser cut-able) case designs. It means you can create your design with the knowledge that when you come to manufacturer the final design the BBC microbit should fit perfectly! 
Having the renders available makes this job much easier, and also ensures an accurate result. We have also used the files in our own models and case designs.
Downloads
The CAD files are individually zipped and will need to be unzipped, with a program like winzip or winrar, prior to use. The PDFs will open in your browser and they can then be downloaded from there.
- .stp file.
- .stl file (Outside shell only – For 3D Printing).
- .obj file.
- .iges file.
- .sat file.
- Mechanical Drawing.
- Poster.
You can see our full BBC micro:bit – Kitronik University Course here.