I haven't really posted any pictures of my 3D printer or any of the items I've printed with it. Here is one of my first attempts at printing with 2 colors. I added the second extruder (the red thing in the background on the left-hand side) this past week and have been getting it set up. It basically works like a hot glue gun that is being moved up-and-down and in-and-out while the bed moves side-to-side. The reason the die looks "hairy" is because of something called "oozing". Basically while the green extruder is printing, the black extruder has filament oozing from it. You can actually see this in the right-most extruder, there is a little piece of filament looped out of it. Basically, when the black extruder head goes over the print, that oozing piece of filament gets attached onto the part.
These are the 2 extruders I have on my printer. The big black and gray blocks are the stepper motors which drive the plastic into the heaters, and the red tubes at the bottom are the heaters. The silver thing on the right hand side (with the orange cap) is an induction proximity sensor which is used for checking the levelness of the bed. The extruder heads need to be at a precise location off the surface of the bed to get a good print, so the induction sensor probes the bed before the print and automatically adjusts the extruder head heights throughout the entire print.
Since the printer can print fairly tight tolerances (100 microns = 0.004 inches), I needed a way to calibrate the printer. That's what the light blue thing is at the bottom. I designed and printed it with just one extruder attached, but basically it allows me to pull the second extruder (farthest right) closer and farther away from the primary extruder. This is really only to get the extruder heads level with each other. To tweek the offsets and get the extruder heads aligned, I have to make a few prints and try and change the offsets that the printer thinks the heads are from one another.
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