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Hi guys,

I made a terrible mistake and burnt my Arduino Mega 2560 and RAMPS 1.4 boards on the R-CNC.
Don't have the time to wait for the new boards I bought from Aliexpress. I have laying around a
MKS Gen 1.4 board which I want to use until I'll receive the boards that I ordered.

1. Is that okay to use the MKS Gen 1.4 with the R-CNC?
2. What is the use of the 100K resistor in the R-CNC? Do you have an idea where I should connect it to on the MKS Gen 1.4 board?



I'll appreciate any kind of help!
Thanks.

Hi 3Dstyle !

You can not use this board instead Ramps besause on the MKS 1.4 the drivers are integrated and you can not plug "step" and "dir" wires

Hi RoMaker, thanks for your answer!

My bad, I have the MKS Gen v1.4, which does have ports for external motor drivers.
I have this one:



I just wonder where should I connect the 100K resistor in this board, and what is the purpose of it?

Thanks!

Hi,
you plug it to the E0 thermistor. It's just because there's a thermal control in the firmware (it's for 3D printers: if there is no thermal resistor, the firmware stops). In fact you can desactivate this somewhere in the firmware, but you have to search on google, I can't help you (and it's faster to just plug a resistor).

Thank you very much Aze!

So basically the 100K resistor pretends to be a "heated nozzle", correct?

I checked quickly into the Repetier code, it seems that replacing: by: should disable the thermistor and assume a fixed temperature of 25°C.
I have not tested myself but if it can help.

3DStyle a écrit : ↑21 août 2018 18:32 So basically the 100K resistor pretends to be a "heated nozzle", correct?

It pretends to be a thermal resistor but yes, it's a bit like a "heated nozzle" if you want. The firmware just check if there is a value on the thermistor (100kohm, 2ohm, 100000kohm, everything but not infinity) otherwise it means than the thermal resistor is broken (it's a brittle component) and your house could burn

Thanks guys, it works great!