Analyze Thermistor?

Veti

that does make sense. its an ultimaker 2 clone.
ultimaker 2 uses thermocouples. so this clone does too.

fcwilt

Thanks for the help.

I will investigate these resources later today.

Frederick

engikeneer

@fcwilt for a quick & dirty check, you could always stick the bed in your oven, set the temperature to ~80deg and leave the wires dangling out the door. Even better if you have a reliable thermistor/thermocouple setup to put in to get an accurate reading of how hot the oven is. Repeat for a few temps and see how different the generated parameters are?

fcwilt

@Veti said in Analyze Thermistor?:

that does make sense. its an ultimaker 2 clone.
ultimaker 2 uses thermocouples. so this clone does too.

Well I treated them as thermistors in RRF3 and they seem to work.

At least I was able to complete M303 but I used the B value from a thermistor I knew which is not likely to be correct.

Frederick

fcwilt

@engikeneer said in Analyze Thermistor?:

@fcwilt for a quick & dirty check, you could always stick the bed in your oven, set the temperature to ~80deg and leave the wires dangling out the door. Even better if you have a reliable thermistor/thermocouple setup to put in to get an accurate reading of how hot the oven is. Repeat for a few temps and see how different the generated parameters are?

I do have an good meter for measuring temps.

Frederick

droftarts

Is the text config file a new thing in Marlin? It still only seems to set the hot end temp sensor, but it is Thermistor #1, so you should be able to look that up in Marlin. Really they should be posting their full Marlin source, where I guess the bed sensor is hard coded.

Ian

fcwilt

@droftarts said in Analyze Thermistor?:

Really they should be posting their full Marlin source, where I guess the bed sensor is hard coded.

I will see what I can find but the web sites are sometimes a bit confusing.

Frederick

droftarts

@fcwilt can you use the Robin Nano electronics with the STM32 port of RRF? I don’t see it in @gloomyandy ’s wiki. https://teamgloomy.github.io/getting_started.html

Ian

droftarts

Looks like the Robin Nano uses STM32F103VET6, so I guess not.

Ian

gloomyandy

@droftarts said in Analyze Thermistor?:

Robin Nano

Short answer is no, not supported.

Longer answer is that there are different versions 1.x/2.x uses the STM32F1 mcu which we don't support. 3.x has an STM32F4 which we do support. However it uses a different SPI unit for SD card access to all of the other currently supported boards (plus a bunch of other differences). Given that we normally read the SD card to get a config file that describes the hardware this means it won't currently work. There are changes in the (currently unreleased) V3.3 version of the port that may make it possible to support the V3 board, but it is not something we have tested so far.

fcwilt

@droftarts said in Analyze Thermistor?:

@fcwilt can you use the Robin Nano electronics with the STM32 port of RRF? I don’t see it in @gloomyandy ’s wiki. https://teamgloomy.github.io/getting_started.html

Ian

I have no idea where you are going with that.

What are you thinking I could use it for?

Frederick

jay_s_uk

@fcwilt it appears as though the printer is powered by an MKS Robin Nano board.
There is a port of Reprapfirmware that supports STM32 processors and droftarts thought it might be compatible with it.
Unfortunately its not as it uses an STM32F1 processor rather than an F4

fcwilt

@jay_s_uk said in Analyze Thermistor?:

@fcwilt it appears as though the printer is powered by an MKS Robin Nano board.
There is a port of Reprapfirmware that supports STM32 processors and droftarts thought it might be compatible with it.
Unfortunately its not as it uses an STM32F1 processor rather than an F4

Sorry - I failed to mention something that is very relevant. My bad.

The printer came with some kind of board but I am strictly a Duet user - their board went into the trash and I am using a Duet 3 Mini 5.

Frederick

jay_s_uk

@fcwilt
the software would've functioned no different to a duet board, but fair enough

droftarts

@fcwilt said in Analyze Thermistor?:

their board went into the trash and I am using a Duet 3 Mini 5.

Great! Though the Robin Nano is probably worth €30, as it’s Marlin and probably Klipper compatible. Usually has TMC2208 or 2209 (same as Mini 5+) drivers on plug in boards. Or donate it to Andy or Jay to see if they can port RRF to it!

Ian

fcwilt

@droftarts

I'll remember that next time and see if anyone wants the electronics.

I've got two unopened printer kits that include some kind of board.

Frederick

DigiD

@fcwilt

This is the method I used , probably could be refined a bit but for me it was close enough

https://forum.duet3d.com/post/191523

dc42

@fcwilt said in Analyze Thermistor?:

@engikeneer said in Analyze Thermistor?:

@fcwilt for a quick & dirty check, you could always stick the bed in your oven, set the temperature to ~80deg and leave the wires dangling out the door. Even better if you have a reliable thermistor/thermocouple setup to put in to get an accurate reading of how hot the oven is. Repeat for a few temps and see how different the generated parameters are?

I do have an good meter for measuring temps.

Frederick

Bed temperature thermistor setting is not critical. Often the bed surface temperature is somewhat lower than the thermistor temperature anyway, especially if the bed is a glass, PEI, PrintBite or similar sheet; in which case you will find what bed temperature setting you need. For example, I use 70C when printing PLA. So for the bed thermistor, I suggest you assume a Chinese 100K thermistor with B3950.

Blacksheep99

I was in a similar position. I did as suggested above and made an assumption. I was able to use an infrared thermometer to measure the bed temps compared to what the Duet was aiming for and they're within a couple of c so I'm okay with that.

fcwilt

@dc42 said in Analyze Thermistor?:

Bed temperature thermistor setting is not critical. Often the bed surface temperature is somewhat lower than the thermistor temperature anyway, especially if the bes is a glass, PEI, PrintBite or similar sheet; in which case you will find what bed temperature setting you need. For example, I use 70C when printing PLA. So for the bed thermistor, I suggest you assume a Chinese 100K thermistor with B3950.

Thanks much. I will give that a try.