The most interesting one I came across was a cutting tool [1]. Have you ever noticed that if you wiggle a box cutter while pushing that it tends to lock up les

The most interesting one I came across was a cutting tool [1]. Have you ever noticed that if you wiggle a box cutter while pushing that it tends to lock up less? This is pretty much that except high frequency. [1] https://www.kickstarter.com/projects/hanboost/hanboost-c1-ultrasonic-cutter-for-diy-maker https://www.kickstarter.com/projects/hanboost/hanboost-c1-ul...