diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp index 0cb1a31f35..05ae8f9c6d 100644 --- a/Marlin/Marlin_main.cpp +++ b/Marlin/Marlin_main.cpp @@ -6587,29 +6587,29 @@ inline void gcode_T(uint8_t tmp_extruder) { // No extra case for AUTO_BED_LEVELING_FEATURE in DUAL_X_CARRIAGE. Does that mean they don't work together? #else // !DUAL_X_CARRIAGE - // - // Set current_position to the position of the new nozzle. - // Offsets are based on linear distance, so we need to get - // the resulting position in coordinate space. - // - // - With grid or 3-point leveling, offset XYZ by a tilted vector - // - With mesh leveling, update Z for the new position - // - Otherwise, just use the raw linear distance - // - // Software endstops are altered here too. Consider a case where: - // E0 at X=0 ... E1 at X=10 - // When we switch to E1 now X=10, but E1 can't move left. - // To express this we apply the change in XY to the software endstops. - // E1 can move farther right than E0, so the right limit is extended. - // - // Note that we don't adjust the Z software endstops. Why not? - // Consider a case where Z=0 (here) and switching to E1 makes Z=1 - // because the bed is 1mm lower at the new position. As long as - // the first nozzle is out of the way, the carriage should be - // allowed to move 1mm lower. This technically "breaks" the - // Z software endstop. But this is technically correct (and - // there is no viable alternative). - // + /** + * Set current_position to the position of the new nozzle. + * Offsets are based on linear distance, so we need to get + * the resulting position in coordinate space. + * + * - With grid or 3-point leveling, offset XYZ by a tilted vector + * - With mesh leveling, update Z for the new position + * - Otherwise, just use the raw linear distance + * + * Software endstops are altered here too. Consider a case where: + * E0 at X=0 ... E1 at X=10 + * When we switch to E1 now X=10, but E1 can't move left. + * To express this we apply the change in XY to the software endstops. + * E1 can move farther right than E0, so the right limit is extended. + * + * Note that we don't adjust the Z software endstops. Why not? + * Consider a case where Z=0 (here) and switching to E1 makes Z=1 + * because the bed is 1mm lower at the new position. As long as + * the first nozzle is out of the way, the carriage should be + * allowed to move 1mm lower. This technically "breaks" the + * Z software endstop. But this is technically correct (and + * there is no viable alternative). + */ #if ENABLED(AUTO_BED_LEVELING_FEATURE) // Offset extruder, make sure to apply the bed level rotation matrix vector_3 tmp_offset_vec = vector_3(hotend_offset[X_AXIS][tmp_extruder],