I work with small thermocouples and Hot-Wire/Hot-Film devices in my lab.  To test and calibrate these devices requires some crazy equipment sometimes.

Try to imagine blowing air on a thermocouple that's in a chain of thermocouples 1mm apart without disturbing the ones on either side.

Hot-films are very sensitive to the air flow direction, and it's difficult to move a big fan around keeping the air flow at accurate angles.

So, after trying straws taped to little fans and other sometimes successful ideas, I designed a small hand-held air jet for this purpose.

The case was designed using AutoCAD, and printed on a SeeMeCNC H2 Delta 3D printer.


I designed it to use a small 30mm fan , and power it with a 9V battery.

Here's the finished unit:


Here's a video of the jet in operation with a hot-film.