In the following video, using some relatively inexpensive parts and a bit soldering, you can build your own calculator. Obviously this is a novel purpose, but hardware hacking should start at the basics. This video is not exactly meant to change your life. It can be said that hardware hacking improves people’s lives, however, especially when they are able to use it to improve technology for the disabled.
The calculator makes use of the Raspberry Pi. The Raspberry Pi has become relatively cheap as newer versions have come out as well as competition. Presumably other do-it-yourself and maker hardware, such as Arduino, could also be made into a calculator if programmed [...]
In the below video, Ben Heck takes you through the basics of building your own 3D printer. To follow his instructions exactly, you would need to buy all the same supplies he uses. These supplies are considerably cheaper now, considering the age of the video. The best place is probably Heck’s sponsor, Element 14.
It is also possible to simply take the instructions he uses as well as this wiki site and from there build your own implementation of a 3D printer. There are also other models out there that can be built.
This is one of the better tutorials out there, and Heck is a good presenter to follow if you’re looking for interesting projects to do at home.