Doing the RepRap #11 – Frame & motors

I got the frame of the Prusa more or less assembled, even though I still need to make sure that it’s straight and so forth. The motors are mounted and connected to the correct rods or belts, and they are stepping at 1/16 nicely, although the LM8UU bearings don’t seem as smooth as I’d like them to be; I will probably re-assemble the Y-carriage whenever I add the hotbed, seeing as that might be cause for some misalignment and grinding.

Robin from the forums popped by the studio and we compared builds and I got some advice which is always welcome; where to source materials, in what order to assemble specific parts, why patience usually pays off better than a flamethrower, etc.

The long M3×60 screws for the adjustable extruder have proved elusive, so I’ve gone for an M3 rod I’ll put wingnuts on. Once you get warmed up and understand how things are supposed to fit together and what functions they perform, you relax enough to improvise. It’s a good feeling. The Makergear hotend shipped with a mounting plate which doesn’t fit my Accessible Wade’s Extruder so I schlepped the studio bike around looking for 4mm plywood to drill a replacement. Once that’s done and the hotend built, I’m pretty close to testing to print.

Perhaps I’ll be able to melt som plastic into a horrible blob in time for tomorrows opening of the new show here at Titanik and impress Sara who’s coming over for a few days. That would be most excellent.

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(yet) Another thing to feel guilty about

It’s always fun to see documentaries that trace everyday objects back to their origins. Usually those films are about bread or maybe books; one comes from wheat, the other from the forest. We get a nice line to follow and are given the option of keeping our hunter-gatherer ancestry in sight. (well, sort of)

I’m always baffled (well, again, sort of) when it turns out that the apples I’m looking at in a store have been shipped across the globe. It just doesn’t make sense to me. And if you try to track down the components and resources of high-tech stuff, you’ve got a lifetime of tracking ahead of you.

Take the example of tantalum, a metal powder extracted from coltan ore, and a required part of cellphones, computers and airplanes. It’s a rare resource: Prices are high and the supply is low. Market forces at work here, people. And those forces are at the moment, to put it gently, bum-raping the people of Congo where there’s a huge deposit of coltan ore.

You have a bunch of rebel groups fueling their civil war by selling the ore to refineries that in turn sell this to high-tech companies (Apple? oh, Apple i though you were a cool company! This shit aint cool! Not cool, y’hear?) and in the process killing people (or enslaving them to work in mines), destroying animal habitat (killing gorillas – your cellphone is killing cute baby gorillas) and generally making a muck of things and adding some more bad to an already quite baddish world.

What to do what to do? I love the quote from Outi Mikkonen at Nokia, when asked how they check up on their suppliers if their tantalum comes from Congo: “All you can do is ask, and if they say no, we believe it.”
Yes, because we all know that Nokia just doesn’t have the resources necessary to check up on the supply chain.

I don’t know what to do, but at least I feel i should know where my stuff comes from. A good place to start on that is here: www.globalissues.org