Calibrate the firmware to print flat
At this point, it is likely that if the firmware instructs the printer to move the carriage across the build surface, the nozzle tip will not stay true to the build surface. Even though the extruder will be at the calibrated correct Z height at each of the three tower locations, it will either be above or below the build surface at the center of the build area. This is also corrected by adjusting the firmware.
Run script D / click button D. The carriage should move up to home, then straight down to the center of the build surface. You will see one of three things. The extruder nozzle will be above the build surface, at just the right height (using the paper test), or will hit the build surface.
The value in the firmware constant DELTA_RADIUS (both Repetier and Marlin) controls the “flatness” of the movement of the carriage at a given Z height. If DELTA_RADIUS is too large, the extruder nozzle will track below the desired Z height inside the calibrated points A, B, and C. If DELTA_RADIUS is too small, the extruder will track above the desired Z height inside the calibrated points A, B, and C.
However, in both Repetier and Marlin (as the code is written), you don’t adjust DELTA_RADIUS directly. DELTA_RADIUS is calculated from the initial values entered earlier:
Read here the rest of this wiki
Hope it helps this time.
At this point, it is likely that if the firmware instructs the printer to move the carriage across the build surface, the nozzle tip will not stay true to the build surface. Even though the extruder will be at the calibrated correct Z height at each of the three tower locations, it will either be above or below the build surface at the center of the build area. This is also corrected by adjusting the firmware.
Run script D / click button D. The carriage should move up to home, then straight down to the center of the build surface. You will see one of three things. The extruder nozzle will be above the build surface, at just the right height (using the paper test), or will hit the build surface.
The value in the firmware constant DELTA_RADIUS (both Repetier and Marlin) controls the “flatness” of the movement of the carriage at a given Z height. If DELTA_RADIUS is too large, the extruder nozzle will track below the desired Z height inside the calibrated points A, B, and C. If DELTA_RADIUS is too small, the extruder will track above the desired Z height inside the calibrated points A, B, and C.
However, in both Repetier and Marlin (as the code is written), you don’t adjust DELTA_RADIUS directly. DELTA_RADIUS is calculated from the initial values entered earlier:
Read here the rest of this wiki
Hope it helps this time.