The dark stuff is "WEICON Flex+bond" glue, which I had only in grey colour. A combination of production error and too much force caused delamination. The glue holds it together nicely.
The main thing I dislike on Wade's extruder until now is the serviceability. When something is blocking the extruder, the drive teeth eat the filament quite fast. For example, a failed part after this happens looks like this:
I haven't found the perfect way to clean this up, yet. I was thinking about a screw on the other side that rotates with the same speed of the gear, but that would add a lot of complexity to it, because a second gearing would be required.
Another idea I had is adding a small wire brush, but that would not be effective on the plastic that got inside the teeth.
[Update]
I'm having success with drive gears made out of a M6 tap. The wider teeth won't eat the filament on normal operation. Even if, a short spray out of ice spray does the job.
On the Plastruder on my MakerBot, I use a technique called "air-blast flossing"; I think it will work for you. Here's more info:
ReplyDeletehttp://teamteamusa.com/curio128
Go!
=ml=
I had no luck removing the plastic between the teeth with a compressed air can.
ReplyDelete