The process is simpler than you'd think. With a basic guitar body design, you can build a model in 3D software (123D Design is free), then take that file via an .stl model into 123D Make, which slices the model into cross sections that you can laser cut (or go analog and grab an Exacto blade). Once those are stacked and glued together, you have a mold!! Read this Instructable on how to do to do it, you'll get no spoilers here.
OR, you can listen to the Safety Third Show - in Episode 1, they go through the experience of the workshop and Blaine sings a little song.
Here's the coverage on Wired Design:
What’s new in 123D Design 1.1? Many of you have asked for some specific features with a new release of 123D Design. We heard you and have integrated many of them in this release! Let’s see some of these features:
Export STL Files
You now have the option to directly export an STL file from within 123D Design, without having to go back to 123Dapp.com to download it.
Now you can export right from the drop-down menu.
123D Design 1.0 only allowed inserting parts through the Parts Bin. Now you can not only insert parts but also merge complete models by using the Insert function. We also made it so that you can insert from your local drive, not just files stored in the cloud!
123D Design 1.1 introduces several new features that many of you requested in the last month. You can now Trim and Extend objects while you sketch. We have also introduced Arc, and also added an option for doing Fillet on two different entities within the sketch.We've also enhanced dimensioning of sketches, and introduced the ability to mirror a sketch. We think these new tools will increase the power of sketching with your design.
More sketching functions!
If you ever wondered how to make sure what’s the distance between two elements, or an angle within a sketch or different edges in your model, now there’s a simple solution.
123D Design 1.1 introduces the Dimension tool. It allows you to select two elements (can be bodies, faces, edges, lines) and display the resulting dimensions.
New dimensioning and measurement capabilities!
Send to CNC Utility
123D Design 1.0 introduced options for directly sending the model to 123D Make, and also allowed you order a 3D print based on your current model. Now we have introduced an option to send the model to a CNC utility, which will lead you through all the steps for preparing your model for fabrication with a CNC device.
Send your model to your CNC device!