The EyeWriter is a DIY low-cost eye-tracking apparatus + custom software that allows people to draw using only their eyes. Eye tracking solutions generally cost upwards of ten grand, but this is just $200 in parts.
If your applying for grants, or just wondering who is using how much money for what, run some searches on Federal Reporter to understand the current state of American federal science funding.
Using wood sticks and nylon filaments Marcelo de Sousa, Cleber Ferraresi, Ana de Magalhães, Elisabeth Yoshimura and Michael Hamblin design von Frey Filaments which perform as well as their commercial alternatives. Von Frey filaments are simply columns of various diameters that buckle at different forces that are often used to diagnose an animals response to stimuli. […]
An anonymous reader emailed us to share a small DIY microfluidic rig equipped with inexpensive board cameras. The chassis is mainly made out of laser-cut acrylic sheets, M6 nuts, and bolts. This GitHub page gives a comprehensive list of components complete with their cost, and instructions on how to assemble them.
Those people at minipcr sure are good at putting together really cheap but solid scientific equipment. Check out their Gyro Plus Micro-centrifuge for just $240. You can get a $150 model without the variable speed, but at that point you might want to just consider a salad spinner.