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Hey

Iv been having great success with my CTC 3D printer over the past few months however I have run into a serious problem. I run latest Sailfish firmware.

I was replacing the nozzle and teflon liner as I do every few hundred hours of printing but after putting it back together I have found that I have a serious error when trying to heat up the printer.

The error is “Extruder failure! Temperature limit reached. Shutting Down”

The temperature 862 degrees just before this happens

I have unplugged both Thermo Couples and also the heating cartridge but I get the same reading. Note I run converted to single extruded.

After doing some research on the issue could be the MAX6675 chip on the motherboard which is really a disaster for me.

Does anyone have any suggestions for me? Since I only run single extrusion can I switch over to using the second MAX6675 chip instead and bypass the potentially faulty one it?

Does anyone have a contact for CTC replacement parts?

*UPDATE*

I enabled the second extruded and went into Monitoring mode. The second extruder temp seems to read normally. I think switching the MAX6675 chips over is my only option as I cant choose to use Extruder 2 only, the only option I think is Extuder 1 OR Extuder 1 + 2.

Does anyone know a hack around to make extuder 1 (and its components) become exturder 2?

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Plug everything in where extruder 2 goes? Might be more trouble than its worth! Might not work!

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I have unplugged both Thermo Couples and also the heating cartridge but I get the same reading. Note I run converted to single extruded.

OK, first, check and see if one of your themocouples has a short. If either do, then you risk ruining your motherboard or at least the fets if you power on, because a thermocouple short will send 24v down your 5v line.

Could also be that a short on one of your extruder heaters, and can cause the same issue.

The sailfish firmware reads the short as a high temperature, and sends the toolhead failure code.

The wires to these short as a result of insulation coming undone, but most likely, as a result of the wires breaking inside from repeated movement of the wires in the same place as prints happen.

You can check if they are shorted with a multimeter.

Until this is repaired, usually by replacing the thermocoupler or the heating element, DO NOT TURN YOUR PRINTER ON as you risk burning out at least the fets, but possibly worse, the whole motherboard.

Good info here:

https://groups.google.com/forum/#!searchin/flashforge/neoteric|sort:relevance/flashforge/eMCJG-vX7o0/D8e2fo2lBAAJ

https://groups.google.com/forum/#!searchin/flashforge/neoteric|sort:relevance/flashforge/s4IdPrcAWvw/QsJQIyCKAgAJ

It is usually not the board, but if it is, you will need to replace the fets.

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I switched the max6675 SMD i2C Bus chips over and im backup and running as long as long extruder 2 is disabled.This extuder chip 1 was FRIED.

Kind of like how you can run on a single kidney as long as your wired right LOL

I have ordered a replacement max6675 from ebay, once it arrives ill replace the faulty chip.

I also sourced a replacement CTC motherboard board from there website, they are 80USD for anyone else who wondering on the price,.

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Yeah, I was worried this would happen. You are lucky you did not burn up the whole board.

I always tell people to NEVER TURN IT ON once the tool failure shows. Its a $12 fix to replace the thermocouples, its a $112 fix, or more, to replace the board.