Add README_variants
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With FW 3.12.0 we introduced the Thermal model see [here](https://blog.prusa3d.com/mk3s-3-12-beta-firmware-new-thermal-model-protection-and-blob-detection_71230).
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This have been finetuned for the stock Prusa MK3/S and may cause issues with 3rd party hotends.
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This README is a guide for the community and the 3rd party companies to prepare/compile/build their own firmware.
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Thanks to E3D and the some REVO community members see [here](https://github.com/prusa3d/Prusa-Firmware/issues/4105) and [here](https://github.com/prusa3d/Prusa-Firmware/issues/3636) we have been able to provide the source code to build the E3D REVO firmware.
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There are other 3rd party hotends which the community uses.
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Steps to add a new 3rd party hotend:
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1. Make a copy of the `/Firmware/variant/1_75mm_MK3S-EINSy10a-E3Dv6full.h` with a new name `1_75mm_MK3S-EINSy10a-<3rd party hotend:16>.h`
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a. Example for the E3D REVO HF 60W: `/Firmware/variant/1_75mm_MK3S-EINSy10a-E3DREVO_HF_60W.h`
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2. Open the new variant file.
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3. Add the 3rd party hotend with new number and the description in the comment part `#define HOTEND 1 //1= E3Dv6 2= E3D REVO`
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a. Example: `#define HOTEND 3 //1= E3Dv6 2= E3D REVO 3= E3DREVO_HF_60W`
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4. Add a new `#elif HOTEND == <new number>` and `#define NOZZLE_TYPE "<3rd party hotend:16>"`
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a.Example
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```
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...
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#elif HOTEND ==2
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#define NOZZLE_TYPE "E3DREVO"
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#elif HOTEND ==3
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#define NOZZLE_TYPE "E3DREVO_HF_60W"
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#endif
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...
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```
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5. Change the `#define CUSTOM_MENDEL_NAME "Prusa i3 MK3S-<Short description:2>`
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a. `CUSTOM_MENDEL_NAME` string cannot exceed 17 chars in total!
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6. Add new PID values for the new Hotend type.
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a. Search for `#else // E3D v6 PID values`
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b. Copy, paste (above `#else // E3D v6 PID values`) and update the new hotend PID default values
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```
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#elif HOTEND == 2 //E3D REVO PID values
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#define DEFAULT_Kp 16.13
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#define DEFAULT_Ki 1.1625
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#define DEFAULT_Kd 56.23
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```
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Example:
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```
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...
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#elif HOTEND == 2 //E3D REVO PID values
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#define DEFAULT_Kp 16.13
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#define DEFAULT_Ki 1.1625
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#define DEFAULT_Kd 56.23
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#elif HOTEND == 3 //E3D REVO HF 60W PID values
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#define DEFAULT_Kp 23.23
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#define DEFAULT_Ki 1.1
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#define DEFAULT_Kd 55.25
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#else // E3D v6 PID values
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...
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```
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7. Prepare for new 3rd party hotend TM value file
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a. Search for `#define TEMP_MODEL_DEFAULT E3D_REVO // Default E3D REVO model parameters` or the last entry
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b. Copy the lines starting with `#elif HOTEND == 2` till the search, paste (above next `#endif`) and update this
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```
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...
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#if HOTEND == 1
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#include "temp_model/e3d_v6.h"
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#define TEMP_MODEL_DEFAULT E3D_V6 // Default E3D v6 model parameters
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#elif HOTEND == 2
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#include "temp_model/e3d_REVO.h"
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#define TEMP_MODEL_DEFAULT E3D_REVO // Default E3D REVO model parameters
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#endif
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...
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```
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Example:
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```
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...
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#if HOTEND == 1
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#include "temp_model/e3d_v6.h"
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#define TEMP_MODEL_DEFAULT E3D_V6 // Default E3D v6 model parameters
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#elif HOTEND == 2
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#include "temp_model/e3d_REVO.h"
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#define TEMP_MODEL_DEFAULT E3D_REVO // Default E3D REVO model parameters
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#elif HOTEND == 3
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#include "temp_model/e3d_REVO_HF_60W.h"
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#define TEMP_MODEL_DEFAULT E3D_REVO_HF_60W // Default E3D REVO HF 60W model parameters
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#endif
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...
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```
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8. Save and close the new variant file
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9. Copy/paste `Firmware/temp_model/e3d_v6.h` as `Firmware/temp_model/<3rd party hotend:16>.h`
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a. Example: `Firmware/temp_model/e3d_REVO_HF_60W.h`
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10. Open the new file `Firmware/temp_model/<3rd party hotend:16>.h`
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11. Search `E3D_V6` and replace it with what you have used in `#defined TEMP_MODEL_DEFAULT`
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a. Example
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```
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#pragma once
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#define TEMP_MODEL_E3D_REVO_HF_60W_VER 1 // model parameters version
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#define TEMP_MODEL_E3D_REVO_HF_60W_P 40. // heater power (W)
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#define TEMP_MODEL_E3D_REVO_HF_60W_U -0.0014 // linear temperature coefficient (W/K/power)
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#define TEMP_MODEL_E3D_REVO_HF_60W_V 1.05 // linear temperature intercept (W/power)
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#define TEMP_MODEL_E3D_REVO_HF_60W_C 8.77 // initial guess for heatblock capacitance (J/K)
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#define TEMP_MODEL_E3D_REVO_HF_60W_R 25.3 // initial guess for heatblock resistance (K/W)
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#define TEMP_MODEL_E3D_REVO_HF_60W_fS 0.15 // sim. 1st order IIR filter factor (f=100/27)
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#define TEMP_MODEL_E3D_REVO_HF_60W_LAG 270 // sim. response lag (ms, 0-2160)
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#define TEMP_MODEL_E3D_REVO_HF_60W_W 1.2 // Default warning threshold (K/s)
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#define TEMP_MODEL_E3D_REVO_HF_60W_E 1.74 // Default error threshold (K/s)
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// fall-back resistance vector (R0-15)
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#define TEMP_MODEL_E3D_REVO_HF_60W_Rv {TEMP_MODEL_E3D_REVO_HF_60W_R, 23.9, 22.5, 19.6, 19.0, 18.3, 17.7, 17.1, 16.8, 16.5, 16.3, 16.0, 15.9, 15.7, 15.6, 15.4}
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```
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