Over at Cool Tools, Kevin Kelly and I interviewed Joshua Schachter, the creator of the social bookmarking site, Delicious, the creator of GeoURL, and the co-creator of Memepool. He's a fascinating person!
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"It's basically a 3-D remover. The examples it comes with are mostly targeted around designed PCB, PC boards, so it comes with copper-clad boards, and you etch away and drill through the places where circuits would, chips would go in, parts would go in, and be soldered to ... It's not too expensive, it's easy to machine .. Other Machine has made software that's actually pretty good if you have 2-D shapes you want to cut out of materials, it can go directly from SVG to machine, and when I'm in a hurry I often do that. It's a tiny CNC machine, but it is a real CNC machine, so it's not dumbed-down in any particular way.
Extruded aluminum rail, 80-20 (price varies)
"80-20 is a series of rail used for industrial and scientific use. It's pretty inexpensive. You can get pieces of it on Amazon. Basically, they're long slots of aluminum with a channel in them so that you can easily bolt, unbolt, rearrange the parts. The nice thing about aluminum is you can actually cut it on woodworking tools. .. [and] it's not irreplaceably expensive, so you don't feel too bad when you mess with it, change it up a bit." Read the rest