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MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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Awesome!!!

I once found a joule thief online...did a tweak to it
on a fresh 1.5vdc AA battery it can run almost 7 days straight...on a battery considered "dead" by most other devices (.9vdc or lower) it will run 2-3 days
Very simple to solder (great kid soldering tool), super cheap, and made with readily available components
check it out
https://oshpark.com/shared_projects/TMmGBSWa