Unresolved TEMP FALL ERROR

very unlikely, if the machine isn't under extruding or jamming I wouldn't expect a nozzle. If you have replaced the heater and thermistor with no change to the issue I'd suggest giving it a once over just to sanity check everything then replace the ramps board. I have one other person I'm helping who has done the same diagnostics you have with tempfall error and we are in that spot as well. The ramps board is typically not the issue but it appears to me you have checked everything else(multiple times). Things in the enviroment of the printer can come into play (ceiling fan, ac unit etc) if there are none of these items blowing on the printer my first thought would be to replace the ramps, they are cheap on amazon.

 

So here is an amazon link to a "spare parts" kit for the electronics.

https://www.amazon.com/Kuman-Printe...&qid=1468156725&sr=8-2&keywords=Ramps+1.4+kit

doing this instead of buying from Robo is much cheaper but will require you to read my thread on taking the R1+ custom ramps board out and putting in a generic ramps board. (mostly just some wiring relocation)

here is that thread if you want to give it a read

http://community.robo3d.com/index.p...and-rewiring-to-make-generic-ramps-work.8356/

if this seems like to much for you send me a PM and I'll see what I can do to help you out.

 

Good work.
As far as the heater core is concerned....either way mounting it will work.
Given that it is so much higher wattage the mounting is not critical.

About all that is left if it fails now is electronics.

 

well, something bad got swapped in
The TEMP FALL is firmware reacting to a perceived temperature drop.
One of the following is true:

1) the temperature actually fell (so bad heater or bad thermistor or bad wiring or bad RAMPS)
2) the temperature reading fell, but not he actual temperature (bad thermistor or wire/connection or RAMPS)

None of these are software

 

Im almost certain this is irrelevant but whats the dc power out of your power supply.

 

I know I've asked you to do this 100 times but are all 3 connection points good on the thermistor. It really sounds like a loose connection the way you pass and fail. There is a set screw under the heater block that holds the thermistor (should be tight) there is the quick release by the stepper motor that should be tight. Give all the wires a tug and see if any come out. Then there is the connection at the ramps board which could very well be loose. give it a tug and see if wires or the harness pops off. If any of the tug tests fail then you may have found your issue. If all those are good I'd suggest the same with the same points of contact for the heater block. If all those check ok then go for the ramps replacement.

 

And it was ramps and arduino ?

 

Ok. So we should check the voltage from the power supply. It should be 12v. If its not there is an adjustment screw to the left of the connections. Its possible low voltage is causing it to go crazy but id think other things would be affected as well.

 

@Toro1966 are you still using the hexagon hotend that comes with the r1+?

 

So, it works fine when you print from the SD card and only fails via the PC? Is that a correct statement?

 

Glutton for punishment eh? Lol. Glad to hear you've got another coming. I enjoy multiple printers