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Custom Changes.txt
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Custom Changes.txt
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Here is a cheat sheet for changing things for specific hardware you may have that differs from the precompiled variants.
LDO Geared Extruder motor:
Configuration.h
You will need to change esteps becaue of the 3.7:1 gear ratio which is 980 esteps at 32x microstepping
Change line 739 to the following: #define DEFAULT_AXIS_STEPS_PER_UNIT { 100, 100, 400, 980 }
BMG is 830 at 32x with a 1.8 degree motor
BMG is 830 at 16x and 1660 at 32x with a 0.9 degree motor but you're better off changing the microstepping to 16x and staying at 830 esteps
Bunny Science extruder addon is 980 at 32x with a 1.8 degree motor
MK3s or Bear extruder is 280 steps at 32x with a 1.8 degree motor
Hemera is 409 at 16x or 818 at 32x with a 1.8 degree motor
Adding 0.9 degree steppers to XY:
Configuration.h
you will need to change the steps per axis to 200 from 100 because a 0.9 degree stepper has 2x the resolution
Change line 739 to the following: #define DEFAULT_AXIS_STEPS_PER_UNIT { 200, 200, 400, 280 }
Configuration_adv.h
If your new motors are 1A no need to change the current. The LDO 0.9 degree motors are 1.4A which is greater than the stock Prusa motors so you'll need to adjust the current.
Change line 2003 to: #define X_CURRENT 1000
Change line 2004 to: #define X_CURRENT_HOME 350
Change line 2019 to: #define Y_CURRENT 1100
Change line 2020 to: #define X_CURRENT_HOME 400
This also means we need to tweak stallgurad settings.
Change line 2294 to: #define X_STALL_SENSITIVITY 60
Change line 2296 to: #define Y_STALL_SENSITIVITY 80
I don't have any other 0.9 degree motors to test so you'll have to test your own stallgurad values. Lower increases sensitivity so if the axis keeps crashign lower the number
if you're getting false positives raise tha value.
Adding Z height:
Configuration.h
If you modify your Z axis by extending the Z and adding taller motors like a zaribo/bear 320 you would need to change the Z height.
Change line 1098 to the following: #define Z_MAX_POS 320
Changing number of probe points:
Configuration.h
If you want to change from 7x7 leveling to 5x5 or 11x11 or whatever you'd need to edit the GRID MAX
Change line 1247 to the following #define GRID_MAX_POINTS_X 5 or #define GRID_MAX_POINTS_X 11
Adding the BIGTREETECH TFT35
Configuration.h
Comment out the stock Prusa Screen by going to line 1762
//#define REPRAP_DISCOUNT_SMART_CONTROLLER
Comment in line 1902
#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
Configuration_adv.h
Comment in line 1451
#define BABYSTEP_ZPROBE_GFX_OVERLAY