The RepRap project has been working on bringing 3D printing to the masses by creating a extrusion printer that can also make the majority of its own parts. For the most part, these print ABS or HDPE plastics which are strong and recyclable. In order to create these replicating printers, similar machines called RepStraps are built out of either laser-cut parts or machined elements. They are functionally equivalent to RepRap printers, but are not made of printed parts. [nophead] documented his RepStrap, HydraRaptor, that is based off a milling machine. He had already printed a set of RepRap parts, and he documented printing a second set. The machine worked for about 100 hours over the course of 2 weeks, printing about 1.5 kg of parts. He made a few adjustments, such as replacing ABS bearings with HDPE to reduce friction. The parts are for Factor e Farm so they can get started with 3D printing.
Related: RepRap pinch wheel extruder
We noticed this article on BotJunkie about Archie the helper bot. Archie is supposed to help out around the house with cooking, cleaning, and other mundane tasks. [Evan] makes a very good point though. Why do people insist on putting creepy heads on their robots. They aren’t making them any more endearing, it’s just creepy. While that is a very astute observation, we would like to add some more. Watch the video above, and study the image after the break. Archie doesn’t seem to be a functional bot. He never moves in the video under his own power. The scene where they “walk” him along is comedy gold. His head keeps falling backwards,or possibly off. And what use is a helper bot that doesn’t have actuated hands? The video is in German, so maybe we’re missing something. Maybe Archie is a mock up or a joke and we just needed translation.
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We know some of you are getting sick of POV projects, but this one was just so cool, we couldn’t resist. [UncleBone] thought POVs were pretty cool, and wondered if he could use one on his ceiling fan. It would have been a breeze just to toss something like the RGBike POV on there and call it finished, but he designed his own. Opting to blow away the norm of using a single row of LEDs, he chose to do 5 different rows of LEDs, one for each blade. The whole thing is controlled by an Arduino, with a spreadsheet for image manipulating. Unfortunately, we don’t see any source files for the project available. Maybe he’ll put them on there if we ask really nicely. If he could get it playing animations, we would just chill and watch it for hours.