markyoe
Senior Member
Did you just get a RAMPS board, or a RAMPS and Arduino?
Just the ramps board. Are you thinking it might be a short in the Arduino?
Did you just get a RAMPS board, or a RAMPS and Arduino?
It sucks that you are dealing with these troubleshooting loops, but blown analog ports on the arduino can cause this problem. And it is the last bit in the system that hasn't been changed.
Would you be able to take a few showing how the thermistor is mounted?
I press the prongs of the multimeter on the exposed parts of the connector. The hot end thermistor did not come without a connector at the end, so I soldered a length of wire, that had a connector, onto the end. The length of wire with the connector came with the kit but was not specified to be used for the thermistor or anything else.But it sure sounds like either an internal break in the thermistor or an issue along the wires - depending on where you're taking your readings.
Me too!I'm dying to see you do some successful prints
We're still only guessing. To find out for sure, you'd have to measure the resistance while the controller is turned on. If the controller throws a temp error while you measure ~100Kohm, then at least you know there is a problem with the controller, which is still my guess. Alternatively, pick up another 100Kohm thermistor from your local electronics shop and see how that goes. IF they dont have thermistors, surely they will have a resistor that you can also use for testing (thermistor is basically a resistor that changes with temperature).
As for the thermistor shorting; I dont know how hard you are pressing, but at some point its perhaps no big surprise it will short out. May or may not be a problem, difficult to tell.
Also, probably not your current problem, butI have to ask, whats underneath those black heat shrinks? Did you solder those wires or did they come like that? If that is the side you soldered, keep in mind the thermistor will reach >250C when printing ABS and the heat will flow easily through thin wires for a short distance. At those temps, the solder could melt. They should be crimped. If they came like that from the manufacturer, then I'll assume they are crimped. The other side of the wiring near the board is no problem (and neither is cable length).
Your thermistor is embedded in that copper piece whatever you call it. Ive never seen one like that, i dont know if you can just remove it, sorry. You should be able to remove the copper piece though, its probably just screwed in the heat block, but doing so wont tell you anything.
As for shop recommendations, again sorry, no idea, I live on a different continent. If Radio shack is still anything like it was 25 years ago here, they might have it and they certainly will have resistors. While you're shopping, see if they sell Kapton (or similar polyimide tape), so you could mount it on the hotend and start printing if it turns out to be the thermistor.
Would something like this work or is this the total wrong piece? http://www.radioshack.com/100k-ohm-1-4-watt-carbon-film-resistor-5-pack/2711347.html
I am waiting for another response from Folger Tech.
If your local store actually has them in stock then yes, that would work as a "fake termistor" to rule out a problem with the ramps/mega.
I'd probably just find some old toy or device and unsolder a suitable resistor from a board I don't care about than pay radio shack prices for one just to test with...but I'm silly that way
Then again even though I have literally boxes of spare resistors I've been known to give in and pay RS prices for a few just because I'm too lazy to dig through the boxes to find the right resistor
Never claimed I was consistent!
Have you calibrated the extrusion?
If you have, then it could be a clogged nozzle. Remove the nozzle (you may have to heat it to get it lose easily), then use a blowtorch to burn it clean.