# How to tell Klipper I am using high flow nozzle and heater core? **URL:** \ **Category:** General Discussion\ **Created:** [May 6, 2025, 6:37pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318 "2025-05-06T18:37:03Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![printeruser](https://avatars.discourse-cdn.com/v4/letter/p/ac8455/32.png) [@printeruser](https://klipper.discourse.group/u/printeruser)\ **Post date:** [May 6, 2025, 6:37pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/1 "2025-05-06T18:37:03Z")
### Basic Information: Printer Model: Prusa i3MK3S+ MCU / Printerboard: Einsy Host / SBC RPi 5 klippy.log ### Describe your issue: I just bought an E3D Heater Core 60W to replace the 40W one I am currently using and a Revo 6 High Flow 0.4mm nozzle. How do I tell Klipper about these two upgrades? From the product page, they mentioned Klipper. [E3D Revo Support: 60W 104-NT HeaterCore](https://e3d-online.com/pages/revo-support-60w-104-nt-heatercore) Am I supposed to put the following somewhere in a configuration file? ```auto ****Temperature Sensor:**** **"ATC Semitec 104NT-4-R025H42G"** ``` ---
**Author:** ![3dcoded](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/3dcoded/32/20297_2.png) [@3dcoded](https://klipper.discourse.group/u/3dcoded)\ **Post date:** [May 6, 2025, 7:32pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/2 "2025-05-06T19:32:56Z")
Hi @printeruser , You don’t have to tell Klipper that you’re using a higher-power heater or a high-flow nozzle. For the thermistor type, you can put in your `printer.cfg`: ```kcfg [extruder] ... sensor_type: ATC Semitec 104NT-4-R025H42G ``` ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [May 6, 2025, 7:32pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/3 "2025-05-06T19:32:56Z")
> [@printeruser](#): > > How do I tell Klipper about these two upgrades? Klipper does not care (that much). The slicer does. ---
**Author:** ![printeruser](https://avatars.discourse-cdn.com/v4/letter/p/ac8455/32.png) [@printeruser](https://klipper.discourse.group/u/printeruser)\ **Post date:** [May 6, 2025, 7:57pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/4 "2025-05-06T19:57:21Z")
Currently in my printer.cfg, I have: ```auto ### EXTRUSION # Extruder [include klipper-prusa-mk3s/extruders/prusa.cfg] # [include klipper-prusa-mk3s/extruders/bmg.cfg] # Hotend [include klipper-prusa-mk3s/hotends/revo.cfg] #[include klipper-prusa-mk3s/hotends/v6.cfg] # [include klipper-prusa-mk3s/hotends/dragon-standard-flow.cfg] # [include klipper-prusa-mk3s/hotends/rapido.cfg] [extruder] # To tune Pressure Advance see https://www.klipper3d.org/Pressure_Advance.html # default is already set based on hotend, but you can further improve prints by calibrating it to your nozzle and material # pressure_advance: 0.05 nozzle_diameter: 0.4 # Remember to change this if you change nozzle diameter. #pid_Kp: 23.862 #pid_Ki: 1.020 #pid_Kd: 139.595 ``` So just put it above or after > nozzle\_diameter: 0.4 ? ---
**Author:** ![3dcoded](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/3dcoded/32/20297_2.png) [@3dcoded](https://klipper.discourse.group/u/3dcoded)\ **Post date:** [May 6, 2025, 9:07pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/5 "2025-05-06T21:07:59Z")
Order doesn’t matter. You can put it anywhere in the `[extruder]` section. ---
**Author:** ![printeruser](https://avatars.discourse-cdn.com/v4/letter/p/ac8455/32.png) [@printeruser](https://klipper.discourse.group/u/printeruser)\ **Post date:** [May 6, 2025, 9:39pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/7 "2025-05-06T21:39:10Z")
Done. Thank you ---
**Author:** ![printeruser](https://avatars.discourse-cdn.com/v4/letter/p/ac8455/32.png) [@printeruser](https://klipper.discourse.group/u/printeruser)\ **Post date:** [May 6, 2025, 9:41pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/8 "2025-05-06T21:41:04Z")
For the Max volumetric speed, what is the recommended value at mm^3/s for Prusa i3MK3S+ with Einsy board, Klipper, E3D 0.4mm brass Hot End nozzle and 60W heater core? What else shall I modify in the slicer? ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [May 7, 2025, 5:31am UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/9 "2025-05-07T05:31:51Z")
You may see here: [Determining Maximum Volumetric Flow Rate | Ellis’ Print Tuning Guide](https://ellis3dp.com/Print-Tuning-Guide/articles/determining_max_volumetric_flow_rate.html) and here: [https://teachingtechyt.github.io/calibration.html#speed](https://teachingtechyt.github.io/calibration.html#speed) ---
**Author:** ![printeruser](https://avatars.discourse-cdn.com/v4/letter/p/ac8455/32.png) [@printeruser](https://klipper.discourse.group/u/printeruser)\ **Post date:** [May 7, 2025, 12:43pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/10 "2025-05-07T12:43:37Z")
E3D Support asked me to put also the Analog input pin to the thermistor in the printer.cfg. What is the Analog input pin connected to the thermistor in our Prusa i3MK3S+? ---
**Author:** ![3dcoded](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/3dcoded/32/20297_2.png) [@3dcoded](https://klipper.discourse.group/u/3dcoded)\ **Post date:** [May 7, 2025, 12:52pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/11 "2025-05-07T12:52:33Z")
Could you please upload a `klippy.log` so I can check if it’s already configured? It should be (assuming you plugged the new thermistor into the same port as the old one): ```kcfg [extruder] ... sensor_pin: PF0 ``` ---
**Author:** ![printeruser](https://avatars.discourse-cdn.com/v4/letter/p/ac8455/32.png) [@printeruser](https://klipper.discourse.group/u/printeruser)\ **Post date:** [May 7, 2025, 1:21pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/12 "2025-05-07T13:21:45Z")
[klippy.log](https://klipper.discourse.group/uploads/short-url/45LhNRnwJzeDPXB4nP3oTi1QsA8.log) (31.0 KB) They sent me this link: [Configuration reference - Klipper documentation](https://www.klipper3d.org/Config_Reference.html?h=4+atc+semitec+104nt+r025h42g#common-thermistors) Under Temperature sensors-\>Common thermistors. It seems that PF0 has been pre-defined in klipper-prusa-mk3s/mk3s/einsy-rambo.cfg when I used this method to insall Klipper: [dz0ny/klipper-prusa-mk3s: Structured Klipper config for Prusa MK3s 3D printer](https://github.com/dz0ny/klipper-prusa-mk3s) Shall I remove the following pre-defined block to avoid confusion and possible conflicts? > [extruder] > nozzle\_diameter: 0.400 > filament\_diameter: 1.750 > heater\_pin: PE5 > sensor\_type: ATC Semitec 104GT-2 > sensor\_pin: PF0 > min\_temp: 0 > max\_temp: 305 ---
**Author:** ![3dcoded](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/3dcoded/32/20297_2.png) [@3dcoded](https://klipper.discourse.group/u/3dcoded)\ **Post date:** [May 7, 2025, 2:25pm UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/13 "2025-05-07T14:25:55Z")
> [@printeruser](#): > > [klippy.log](https://klipper.discourse.group/uploads/short-url/45LhNRnwJzeDPXB4nP3oTi1QsA8.log) (31.0 KB) According to that log, everything is setup correctly for the Revo. You shouldn’t need to change anything to use it. > [@printeruser](#): > > klipper-prusa-mk3s/mk3s/einsy-rambo.cfg You shouldn’t edit anything under the `klipper-prusa-mk3s/` directory. Anything you want to be changed can be overridden in `printer.cfg`. ---
**Author:** ![Jarhead](https://avatars.discourse-cdn.com/v4/letter/j/f1d935/32.png) [@Jarhead](https://klipper.discourse.group/u/Jarhead)\ **Post date:** [May 11, 2025, 9:54am UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/14 "2025-05-11T09:54:53Z")
Just make sure to PID tune! ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [July 10, 2025, 9:55am UTC](https://klipper.discourse.group/t/how-to-tell-klipper-i-am-using-high-flow-nozzle-and-heater-core/23318/15 "2025-07-10T09:55:39Z")
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