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hot end will not heat up, either with the manual extruder on button or autotun. the thermister is working and I can put my fingers on the hot end and the temp goes up just from the heat of my Fingers. wire continuity from the rambo thru the resistors and back to the rambo is good. autotune command initiates the run there is a relay click and the 2 red lights on the rambo come on... then auto tune fails after a few minutes. What should I check? is it possible it is engaging the wrong extruder heater relay on the Rambo?

Tom C

There is an LED under the Extruder 0 Heat, does it come on when you are in host and tell it to heat the extruder?
Are your hotend wires connected to Extruder 0 Heat?

If both of the above are yes and the Hotend does not heat then you have a bad connection to the hotend.
Use a multimeter and measure for 12 volts at the Rambo Extruder 0 Heat connectors being careful not to short anything.

There are no relays anywhere on the Rambo or circuitry contained on Rostock MAX so I'm not sure what you
are hearing when you say you hear a relay click. Unless you added a relay somewhere.
Get back to us if you have not found the problem but answer the first two questions. Saying that LEDs come on
does not help unless you state where the LEDs are.

must be just the rambo click coming off the speaker. heater and fan are on extruder 0. there are 2 red leds under the white iscp label in the picture you posted. yes they come on. I did a continuity check from the extruder 0 + terminal all the way thru back to the hot end - terminal will look for voltage at the terminals and at the extruder. thanks

Tom C

never let a good failure go to waste! so when you are building your hot end at 12 midnight remember to NOT solder your resistors to themselves as opposed to thru the hot end pos to neg..
Tom C

stonewater wrote:never let a good failure go to waste! so when you are building your hot end at 12 midnight remember to NOT solder your resistors to themselves as opposed to thru the hot end pos to neg..
Tom C

Also remember to never solder the resistors to anything. Those connections must be crimped with the proper connector, solder will melt at the temperatures the
resistor leads experience. If you soldered them, redo the hotend connections I guarantee that solder will not work.

ok will do broke my thermistor......

That's about one step removed from the guy that plugged his power strip into the power strip and got mad because his computer didn't turn on... *laughs*

Don't feel bad, we've ALL done some really silly things during the build.

g.

ok, I have the stuff put in THE RIGHT WAY! I think. thanks SeeMe stuff I ordered came FAST!


now the hot end heats up...... and then when doing the autotune it says TEMP TO HIGH then says autotune fail. looks like on the temp curve its only going to 220 or so...... setting in the config wrong?

stonewater wrote:ok, I have the stuff put in THE RIGHT WAY! I think. thanks SeeMe stuff I ordered came FAST!


now the hot end heats up...... and then when doing the autotune it says TEMP TO HIGH then says autotune fail. looks like on the temp curve its only going to 220 or so...... setting in the config wrong?

See this topic it may be of help. http://forum.seemecnc.com/viewtopic.php?f=54&t=1279