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lower part of rostock hot end falling down!
Posted: Sun Aug 11, 2013 6:28 pm
by JAY
I am configuring the Repetier software to the Rostock Max. I am on page 156 of the Rostock Max Assembly Guide where I'm configuring the end stops. After I found the Z axis's end stop screw didn't require any turning, I moved on to the Y axis. I inputted the 'G28' followed by 'G0 Z5 X77.94 Y-45 F3500' and found that my screw needed adjustment. At that moment I started seeing smoke come from the hot end.
As I looked closer where the smoke was coming from and noticed the tip of the hot end (the part that the resistors are in) was falling a bit. I gently touched the copper nozzle with a screw driver and noticed that the tip with the resistors is now loose! I immediately turned the hot end heat off. the tip is now loose from the extractor. What have I done wrong here?
Re: lower part of rostock hot end falling down!
Posted: Sun Aug 11, 2013 6:45 pm
by Polygonhell
Most likely the thermistor was not in good contact with the aluminum, and as a result was reading low, resulting in you over heating the PEEK portion of the Hotend and it melting.
I really would not take a Hotend up to temperature without first verifying that the thermistor was reading at least mostly accurately at lower temperatures by using a thermocouple.
FWIW I destroyed the first Hotend I ever owned because the thermistor wasn't properly secured and it creeped out during a print.
Re: lower part of rostock hot end falling down!
Posted: Sun Aug 11, 2013 7:07 pm
by JAY
Just checked and you were right. The way I had the thermistor wires-as it traveled to the Y axis, it stretched the thermistor wires and pulled the thermistor and rtv out of the aluminum hole. Damn.
Re: lower part of rostock hot end falling down!
Posted: Sun Aug 11, 2013 9:34 pm
by JAY
Well, I overheated the hotend and pushed the tip back into the extruder carefully by lowering the Z axis down and pushing the tip back in, then once I had it pushed back in applied 12V to the fan, cut the heat to the tip off and cooled it. Seems to be working.....
Re: lower part of rostock hot end falling down!
Posted: Sun Aug 11, 2013 11:18 pm
by Eaglezsoar
You should buy a new piece of the peek plastic. The one you have is not going to last long after
being heated enough to start melting.
Re: lower part of rostock hot end falling down!
Posted: Tue Aug 20, 2013 5:35 pm
by JAY
Steve with seemecnc.com 2-day shipped me a new Peek under warranty. Good job guys!
Re: lower part of rostock hot end falling down!
Posted: Wed Aug 21, 2013 3:05 pm
by kbob
Did you import your camera from Australia?
Re: lower part of rostock hot end falling down!
Posted: Tue Sep 03, 2013 2:38 pm
by dsnettleton
kbob wrote:Did you import your camera from Australia?
I got this joke. It cracked me up.