Computer Aided Design:
	At school I learned to make drawings by hand on transparent paper using pens and rulers on a drawingboard. In the beginning we used the same technic at work. Some years later CAM was introduced. Programs for the punchingmachine were made by hand and typed into a "computer" that used 7 1/2inch floppy's. After it had checked the program, it was send to a papertapepunch that made a papertape. The papertape was send to the punchingmachine. The operator would read in the papertape. Some years later the Amacom "computer" was replaced with a CAD/CAM system from  Radan that ran on a Sun Sparc1. In those days there was no Graphical User Interface (GUI), just a black screen and some popup menu's. The menu's were progammable and so were a lot of keys of the large keyboard. I switched jobs and got a Sparc LX and a new version of Radan. Later on 3D was added to the CAD program. Some years later our 3D designs got too big for Radan. We started to use another CAD program for our 2D and 3D work, SolidWorks. This is the program I make my designs in at work. At home, when I transfer the license from work, I also use SolidWorks. At times I still use my drawingboard or even a simple 2D CAD program called Qcad. There is a free and open source version of Qcad available for Windows, Linux and Mac. Long time ago I've made library files with all sorts of nuts and bolts for Qcad. A few years ago a 3D printer came to my office. It is a "hobby" printer, an UP! mini. Besides printing some small prototype-parts, I also use it for printing "Awards" for 12,5 or 25 year jubilees. Since a couple of weeks we also have an UP! Box. It makes use of the same technique, it's just a bit bigger and faster.
	3D printen van camera houder op YouTube.
	3D design for printing on Thingiverse.
	3D designs on 3D Content Central, for use in 3D-CAD systems like SolidWorks, AutoCad and Catia.