SoliForum - 3D Printing Community — Hot end melt down 320C +

Re: Hot end melt down 320C +

2013-05-27T19:45:20Z

Love the name print! Glad your back up and runnimg!

Re: Hot end melt down 320C +

2013-05-27T12:41:32Z

http://www.soliwiki.com/%27%27%27Extrud … p%27%27%27

Re: Hot end melt down 320C +

2013-05-24T22:27:33Z

Back up and running with PrintrBot hotend. The mounting is way too tight so I am going to make a new mk4 receiver with a little play in the mounting. I also had to harvest the old connectors from the stock hotend. The thermistor seems to be the same so after a quick PID Autotune and adding 1/2 inch to the z-end stop switch I am printing again. I don't think that my replacement hotend from solidoodle has even shipped yet. Looks like this will be my new setup for a while.

Note: Also had to change the firmware to accept my new hotend operating temp of 220C (max for me is 235 now). They put this thermistor on top of the heating element pretty much.

Re: Hot end melt down 320C +

2013-05-24T19:23:04Z

IanJohnson wrote:

I would recommend an Azteeg X1 as a sanguinololu equivalent, or X3 as an upgrade, from panucatt.com. The X1 is better quality than Sanguinololu, supports a gcode controlled fan directly, and has headers for plugging in a SDRAMPS card reader.

That X3 is pretty. Is the AtMEGA2560 compatible wit the Sanguinololu? I have a spare Sanguinololu that I am going to use as a test board for my bowden setup. However, it doesn't have the ability to attach a second extruder so I will need something with more drivers. The X3 is almost overkill in that department with 8 driver slots! wow!

Re: Hot end melt down 320C +

2013-05-24T17:54:49Z

I would recommend an Azteeg X1 as a sanguinololu equivalent, or X3 as an upgrade, from panucatt.com. The X1 is better quality than Sanguinololu, supports a gcode controlled fan directly, and has headers for plugging in a SDRAMPS card reader.

Re: Hot end melt down 320C +

2013-05-24T17:45:40Z

Oh no that makes my problems trivial! I've ordered an all metal hotend with built in fan form e3d. They are british so easy for me to pick up. Where is the best place to get spare eletronics etc? From reprap?

Re: Hot end melt down 320C +

2013-05-23T21:33:21Z

IanJohnson wrote:

If you are picking up spares, consider ordering a stepper driver or two. When I had to send my Azteeg in for replacement after I fried something, I was able to get my Sanguinololu back into service. When one of the Pololu steppers burned out, I swapped it for one of the drivers I got with the Azteeg. I started getting Y skipping, and fixed that by replacing its driver as well.
You don't need to completely duplicate the printer, but picking up some spares here and there when you don't need them will make you very happy if you eventually do. Nozzles, PEEK barrels, and resistors would be at the top of that list.

Good call on the PEEK. I could use one right now.

Re: Hot end melt down 320C +

2013-05-23T21:32:54Z

So the mosfet switch worked as a temporary fix. I was unable to successfully get my hotend back together however. It was way too far gone. The peek won't hold the barrel. I am hoping my SD replacement ships soon or that I get one of the other hotends that I have ordered.

Re: Hot end melt down 320C +

2013-05-23T18:39:17Z

If you are picking up spares, consider ordering a stepper driver or two. When I had to send my Azteeg in for replacement after I fried something, I was able to get my Sanguinololu back into service. When one of the Pololu steppers burned out, I swapped it for one of the drivers I got with the Azteeg. I started getting Y skipping, and fixed that by replacing its driver as well.

You don't need to completely duplicate the printer, but picking up some spares here and there when you don't need them will make you very happy if you eventually do. Nozzles, PEEK barrels, and resistors would be at the top of that list.

Re: Hot end melt down 320C +

2013-05-23T16:35:42Z

Rincewind wrote:

I think then it should be a drain-source short circuit of the MOSFET in the hotend drive. Apparently those little buggers do that. If you are lucky, the atmega pin is still ok and you can just replace the mosfet (and the hotend). If you are unlucky, the pin is fried too and you need to replace the chip... Sorry for the bad scenario...

I think you are right about the mosfet. When I plug power into the board the hotend starts heating up with out the extruder heater button selected.

While I wait for my new Mosfet I just switched the one for the heated bed and the hotend. Anything to get me back up and running.

Re: Hot end melt down 320C +

2013-05-16T02:59:15Z

I'm getting replacement board and hotend so I can troubleshoot the board and have spares for when/if this happens again. I am beginning to understand that in the world of 3D printing, you can never have enough spares. I have all the recommended spare parts printed but now I will have some spare electronics too. I might need help troubleshooting the board. I will post what went wrong when I find it.

Re: Hot end melt down 320C +

2013-05-15T14:21:16Z

I think then it should be a drain-source short circuit of the MOSFET in the hotend drive. Apparently those little buggers do that. If you are lucky, the atmega pin is still ok and you can just replace the mosfet (and the hotend). If you are unlucky, the pin is fried too and you need to replace the chip... Sorry for the bad scenario...

Re: Hot end melt down 320C +

2013-05-15T14:01:58Z

the thermistor was reading the entire time. The power to the heater never backed off.

Re: Hot end melt down 320C +

2013-05-15T13:42:35Z

coleke wrote:

You might have a bad connection to your thermistor- from what I gather if the temp sensor fails mid print, the board will see 3 degrees Celsius and attempt to increase the hot end temp. However I think this was fixed in a firmware update. Are you using Lawsy's firmware or stock?

Yes but that wouldn't explain why he's seeing 320°C in Repetier, and rising... That's a really odd behavior... Unless the thermistor failed and then started working again when it was already too late.

Re: Hot end melt down 320C +

2013-05-15T13:02:29Z

You might have a bad connection to your thermistor- from what I gather if the temp sensor fails mid print, the board will see 3 degrees Celsius and attempt to increase the hot end temp. However I think this was fixed in a firmware update. Are you using Lawsy's firmware or stock?