I don't know what's causing this problem, but I'm experiencing it also. I haven't disassembled the nozzle yet, but when I pull out the filament that had been in the hotness, there is a bulged area near the tip -- I'm guessing that when I disasemble, it will look very much like you describe. Did you find any solution to this, other than switching back to an old nozzle?by krolco - Ormerod
Also, one more interesting data point: when I have firmware flashed (currently 1.09), and I connect to the Duet with Pronterface, sometimes I get garbled responses -- doubled or missing characters (for instance, the line starts with kk instead of ok in the response). I'm wondering if that's related or just a separate issue...by krolco - Ormerod
Hello again! It's a Late 2011 15-inch MBP. I was able to see the same thing as you on the USB device listing, but no serial port showed up in my /dev/* list. What output do you see with bossac when the firmware is erased? When I run bossac it reports that the port auto-scan failed. What did you do to install Arduino? I just downloaded and ran the file. Was there something else you installed?by krolco - Ormerod
I bought 2mm drill bits as part of an inexpensive set at my local Harbor Freight. They don't have full metric sets, but they do have "mini" sets with 2mm for a few dollars. Hope that helps!by krolco - Ormerod
Hi Ian, I was talking to you on IRC about this exact problem. I was able to connect the board to Windows machine (another Mac, a 2010-era iMac, but running Win7), and I was able to update the firmware using the Windows version of the Arduino IDE and bossac. Afterwards, I am able to connect to the machine again on my Macbook Pro. It seems that Mac OS 10.10.3 doesn't recognize the "empty" Due aby krolco - Ormerod