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Thomas Sanladerer designed , printed and tested this filament diameter sensor. It could bi used on filament making extruders as a control sensor, or in 3d printers to get better printout results. The work on it is in progress, further accuracy improvements are needed but the current results look promising.































Files can be found at:

https://www.youmagine.com/designs/filament-diameter-sensor


From project description:

This is a proof-of-concept filament diameter sensor, currently intended for an extruder making filament. The filament centerline is 90mm above the mounting surface.
It picks up the filament's diameter between two bearings, amplifies it via the lever by a factor of 3.6, which moves a magnet in front of the hall sensor.
The hall sensor's depth is adjustable and is locked into place via the M3 bolt. Bend the hall sensor's leads 90° to the back and place the sensor in recessed spot. Lead the wires out to the front.
The 6x2mm magnet goes into the matching hole in the lever. The second hole intended for a ballpen spring, which is not needed in most use cases.
For testing, upload the included sketch to an Arduino, connect the hall sensor to 5V, ground and hook the signal pin up to A1 on the Arduino. Connect via serial at 115200 baud, it will start spitting out two values each line, the first one is the smoothed ADC value, the second one the calculated diameter. To calibrate, insert a test object with the maximum diameter you want to measure between the bearings and move the hall sensor carriage until the ADC value just reaches a maximum. Lock the carriage in place and use that value along with the diameter of the object as the last entry in the Arduino's lookup table. Insert two (or more, if you increased NUMTEMPS) more objects of varying sizes (for example the shafts of drill bits) and fill out the lookup table. Use the idle position without anything inserted for the zero-diameter position.
Support might be required for the files as they contain 30° overhangs. If you use Slic3r, you're better off with no support material.

You can download the design files and cut the beehives on a CNC machine.





From project webpage:

The Open Source Beehives project is a collaborative response to the threat faced by bee populations in industrialized nations around the world. The project proposes to design hives that can support bee colonies in a sustainable way, to monitor and track the health and behaviour of a colony as it develops. 

Each hive contains an open source sensory kit, The Smart Citizen Kit (SCK), which can transmit to an open data platform: Smartcitizen.me. These sensor enhanced hive designs are open and freely available online, the data collected from each hive is published together with geolocations allowing for a further comparison and analysis of the hives.

Project webpage:

http://www.opensourcebeehives.net/


Download the files at:

https://github.com/opensourcebeehives

Printing technologies are expanding further. SenSprout is a device for monitoring air and soil moisture in order to optimize agricultural production and irrigation management. It is produced by printing the electronic circuits on paper with silver nanoparticles. It is powered by ambient radio frequencies (it harvests 2,4 GHz frequencies) and transmits data on same frequency.
I wonder how practical it would be for real life application since it looks fragile, it is currently deployed and tested. Even if not practical, concept is excellent technology demonstrator: downloadable printable sensors powered with surround electromagnetic radiation. Cool!
They use commercially available inkjet printers and commercially available conductive ink from Mitsubishi.
Project by: Yoshihiro Kawahara

SenSprout printed moisture sensor deployed (source:Wired)

I think this is Mitsubishi silver nanoparticle ink they mentioned: http://www.mitsubishiimaging.com/digital-imaging-diamond-jet-NANOINK.html







Applications of 2d printed electronic circuits are infinite, similar to 3d printing. Hopefully this technology will soon expand into DIY space. There are many corporate and academic developments in conductive inks, but conductive ink can be also produced in DIY / home lab setting (this one doesn't work on paper):




Ink video by NurdRage