What you see above is the culmination of [Zach Smith]’s work building a pinch wheel style extruder for the RepRap. The current RepRap 3D printer uses a screw mechanism to push 3mm polymer filament into a heating barrel where it is melted and then extruded through a fine nozzle. [Zach]’s new version uses a drive gear from SDP/SI mounted directly to the DC motor we saw him teardown earlier. He’s redesigned the carrier for the extruder as well. It’s now much lighter and has provisions for mounting current and future controller electronics along with a magnetic rotary encoder. In the last two days, he’s been doing real world testing. It’s been doing well, but he’s learning to do things like always using a full spool and not trying to run short lengths back to back.
Maybe you wiped your iPhone by filling the hard drive with music, or maybe you used a more sophisticated method. In either case, your phone is clean, but the hard drive in your computer is still chock full of evidence of your misdeeds (or just personal emails to your mother). If you fear forensic analysis will expose your wheelings and dealings, then a full format is not enough; you’re going to have to obliterate the plates inside the hard drive.
To that end, [Eecue] posted this worklog of slagging a hard drive. Using a propane powered furnace, he melted most of the drive’s components by placing it in a steel crucible which was lowered into the furnace. After a few minutes everything but the steel casing and a few bits of woven fiberglass from the PCB were melted down completely. You can see the entire process in [Eecue]’s drive slagging photo album.
With solid state drives becoming popular and their inherent difficulty of assured erasure, physical destruction is looking like a lot more reasonable option. As you readers have stated in the past: it’s certainly a lot more fun.