Extruder switched off. MAXTEMP triggered !

Im trying to run my new printer (just received yesterday) with ABS at 240C but the printer crashes at high temp. I noticed I could maintain 220 with out any issues so I manually increased the temp to try to find the max temp before the crash. After some slow manual increments I found that my printer craps out at about 234 which unfortunately is not hot enough to extrude my ABS. Here is the error:

< 10:15:42 PM: FIRMWARE_NAME:Marlin V1; Sprinter/grbl mashup for gen6 FIRMWARE_URL:http://www.mendel-parts.com PROTOCOL_VERSION:1.0 MACHINE_TYPE:RoBo 3D EXTRUDER_COUNT:1
< 10:19:39 PM: Error:0
< 10:19:39 PM: : Extruder switched off. MAXTEMP triggered !
< 10:19:39 PM: Errorrinter stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting)
Ive read here in the forums that other people run ABS at 240-245 without any issues. Any suggestions on what I can do to reach those temps? Is there a max setting that I didn't adjust somewhere or is my unit defective?
Oh and my printer did not come with the plastic rod that inserts into the spool. I would print one but I have that temp issue.

 

Does your printer have a fan cooling the controller? The controller is located where the USB cable plugs into the robo. I was having an issue with abs as I could not get the bed to go to 95c. I used a 12v computer fan out of an old computer and put it under the robo pointing at the controller and it fixed the problem of resettable fuse cutting out. I understand that the new series of robo's already have this fan.

 

The Max temp is a safety feature, if you have the originally nozzle that came with the robo, you can't even print at 240, your nozzle will melt. You need to get a all metal nozzle, like the E3D. Also, I've never heard anyone printing ABS at 240.

 

Maybe my thermistor is in error, but I have to print abs at 240/230, and it does! I also have to print pla at 220/210 to get strong prints and no strings.

 

couple of things..

Like Seshan stated.......Max temp is a safety feature built into the firmware so you don't get a hot end meltdown. If you trigger this.... that pretty much means you tried to heat it over the set firmware value.

I don't remember but i think the max temp for the stock hot end as configured from robo is 240c. I don't have their recent updated firmware in front of me to take a look. But for peek hot ends such as the robos 240c+/- is somewhere in the melting point of your peek hot end. (keep in mind this is probably a conservative number)

I've seen people go over that limit by changing the max temp firmware value with some other configuration changes. be aware you'll need to have a hot end cooling fan to keep the peek cool enough. That along with the filament extruding through will sometimes allow you to run up to 260c. (the filament pushing through acts as a cooling medium also taking the heat away from the peek hot end) I don't recommend this because if your fan breaks down and/or your filament stops extruding.......well you end up getting a hot end meltdown.

another note.. if you haven't calibrated your printing temps with a contact type meter. Then you'll never know what your actually printing temperatures are. 240 in rephost.. isn't necessarily 240 at the hotend.... thermistors dont just get errors.. they either work or they don't.

 

The MAXTEMP for Robo 3D is actually 235c, at least according to the last firmware publicly posted by them.


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Thanks of the info everyone but now I have a few more questions.

1. Can the firmware be modified? If so please point me in the right direction.
2. Is there a data sheet to confirm what the "stock hot end"/extruder temperatures are? I don't want to damage it, its best to stay within the manufacturers specific ratings but if the firmware is limiting the heat capabilities then I would like to take a look.
3. Is the ABS plastic purchased directly from Robo3D capable of melting properly under 234?

 

You can find links and instructions on how to load new firmware on the Robo 3D User's FAQ which you can find at http://lele.io/robo3dfaq

See section A.3. for the forum link to the firmware. I forget what section is the instructions on how to do the firmware update. Actually just looked. It's section B.9.

Let me know if the instructions are unclear and if so, how they are. I'll modify them to clear them up.

Mel

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