Jump to content
Ultimaker Community of 3D Printing Experts
  • Sign Up
darelleman

Ultimaker Original HB Thermistor Firmware

Recommended Posts

Posted · Ultimaker Original HB Thermistor Firmware

Hi all,

I've been trying to fit my Ultimaker Original with a DIY heated bed that I am making. I am currently stuck trying to get the 100k thermistor I bought to work correctly. I bought a pack of 100k NTC 3950 thermistors specifically labeled for 3D printers. On the listing for these thermistors it states "use TEMP_SENSOR 11 in Marlin firmware " but I am using the bUltimaker firmware builder which has preset options for thermistors. I have tried both options that mentioned 3950 but to no avail. The thermistor clearly works, yet reads 23 degrees Celsius while my standard reads 32 degrees Celsius. So I can tell that the curve is off, I just can't figure out why that would be so and how I can fix this. Do any of the options in the firmware builder align to Temp_Sensor 11? If not what can I do other than compile Marlin myself? I greatly appreciate any help, as I am currently very stuck.

Share this post


Link to post
Share on other sites
Posted · Ultimaker Original HB Thermistor Firmware

Well here is the line of code they are talking about when they say to use #11:

 

https://github.com/Ultimaker/Marlin/blob/Marlin_v1/Marlin/thermistortables.h#L567

 

As you can see it's the 3950 thermistor.  It doesn't say what pullup resistor to use.  Did the place that sold these to you tell you what pullup resistor to use?  Usually it's 4.7K but some of these have other pullups.  If you look at the builder "none" is #0 and if you count down 11 from there it's that one.  That's #11.

 

Are you sure your bed isn't 23C?  32C seems awfully hot.  23C sound like typical room temperature.  You could heat the bed to 60C and put some PLA on there under a small towel for a few minutes and after things settle bend the pla and it should stay bent at 60C and not at 45C (it gets soft, similar to clay around 52C).

 

Ask the manufacturer of the thermistor what pullup you should use for "marlin sensor 11".  Most use 4.7K but some use 1K pullups.  Did you install a 4.7K pullup?

 

 

Share this post


Link to post
Share on other sites
Posted · Ultimaker Original HB Thermistor Firmware
13 hours ago, darelleman said:

Do any of the options in the firmware builder align to Temp_Sensor 11?

 

You find the corresponding numbers in the comments of "Configuration.h":

 

https://github.com/Ultimaker/Marlin/blob/Marlin_v1/Marlin/Configuration.h#L111

 

11 is 100k beta 3950 1% thermistor (4.7k pullup)

 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Our picks

    • Talking additive | The 3D printing podcast
      Why should we be the only ones asking questions? Join us and ask Jabil all your questions on September 22nd 5pm CET
        • Like
      • 2 replies
    • Ultimaker masterclass: Optimizing your Ultimaker Cura workflow
      Save your seat for either broadcast on September 23.
      What will you learn?
      · Best practices for iterative print preparation and every lesson you should learn from each print
      · The right way to use per-object settings and when they are most useful
      · Easy-to-use resources for anyone who wants to develop their own printer definitions, plugins, or print profiles
      · How to optimize print profile settings and whether to “keep” or “discard” changes
      · When is the right time to export your drawing from CAD? (Based on Ultimaker Cura’s surprising power as 3D control software)
      · And a whole lot more tips and tricks!
       
      How can I join?
      This free masterclass will take place twice:
      1. 11am CEST (5pm SGT, 5am EDT)
      2. 5pm CEST (11am EDT, 8am PDT, 11pm SGT)
        • Like
      • 0 replies
    • Do you use 3D printing at work? Let us know
      It doesn't matter if you are using 1 Ultimaker or 10, there is inspiration in everything. We're looking for ...
      • 1 reply
×
×
  • Create New...