Burned Extruder heating Element, temperature sensor was loose !

[Jan Pettersson]

When starting up for my first print I had problems to get 200. Suddenly flames from the wires to heating element.
After I examine it closer I found that the the temperature feedback thermistor was loose and hanging outside the hole!!!!

So I probably have destroyed the heating element. On the picture below I tryed to put the thermistor back but now there is no heating.

Now I need a replacement, does anyone now where to get it???
Number, temperature ........
How is the thermistor fastened? Thermal compound only??



Heating Extrudor1.jpg

[bolsoncerrado]

You have the answer on your picture. That black hole is a screw you need to tighten....

Have you checked the wires in case you have shorted them and you can still recover the thermistor? just clean up the mess and use electric tape to isolate them and try again.

The thermal compound is just for the temp sensor i think.

[Jan Pettersson]

I have uninstalled the heating element.With the screw on the left.
The wires are burned off. I measure 3 Ohms on the element.
How do you connect new wires? Normal soldering will not work.
To the right of the heating element is two white wires, they are the "temperature feedback" .
They are just come very easy loose as there are no screw to fasten it.
Just some white compound in the hole.
Heating Extruder 2.jpg
Heating Extruder 3.jpg

[Leon]

May I know whats the white stuff for the temp fasterner as mine came off too, should I just put it back or need to add somr glue to lock it in

[bolsoncerrado]

Id ask a new heater to Ethan, i dont think this has any easier solution without risking taking fire again or worst (a short)

[Jan Pettersson]

I have send a email to hello (at) rapide-3d.com but its holidays so no respons. I would like to have a screw that locks the sensor. I think the white is Thermal compound. Anyone who knows the voltage that feed the heating element?

[BobenhamHotspur]

Anyone who knows the voltage that feed the heating element?

There was a question regarding voltage in the comments on the indigogo website, I believe Ethan said 12 volts, but please check for safety's sake.

[npou]

I would love to see an annotated picture of how it should look like. I would like to check mine is properly setup as its my first 3d printer.

thanks in advance

[bolsoncerrado]

The temp sensor "locks" with thermal paste, yes.
The temp heater "locks" with a scew...

On my fourth print, something started to smell like burnt sugar, it was the heater heating the filament way over it should be and it was literally boiling it...

SO i turned everything off and now when i try to start a new print, heater reaches 160º only...

[lawong]

The thermal grease is white so probably is Lithium Grease, you can get one at:

Thermal Grease

I would even put a dab (tinny dab, size of grain of rice) on the heater to improve the heat transfer.

Use a toothpick to put into the hole and level it, then jam that thermistor bead into it, putting too much won't be a problem, just greasy messy everywhere (on your hands, jeans... ). Not poisonous unless it has beryllium compounds in it (read the label). Lithium is safe, it's even used in medicine (small amount).

It's not electrically conductive so no worry about shorting out connections.

Some 3D printers uses a strip of Kapton tape to wrap the thermistor and heater on the hot-ends but I think the "nude" version is better.

As with any heavy machinery, double check all connections before take-off!
Be like the airline captain to give that all-clear check before hitting start.