The inline power value is stored in the planner blocks so that laser power can be perfectly synchronized with every move. Power values are set when movement G-codes G1/ G2/ G3/ G5 are processed with an S-Value parameter such as G1 X10 Y10 S100. Without a PWM pin the cutter is simply turned on full for any non-zero value and off for zero. If PWM hardware is available it is activated by defining SPINDLE_LASER_USE_PWM, providing a range of power levels. This pin should be a hardware-enabled PWM output for optimal performance. Inline Mode applies power to a selected laser output pin defined by SPINDLE_LASER_PWM_PIN. Since Marlin 2.0.9.x you’ll get the best results using Inline Mode power control. (It is similar to GRBL 1.1f in M4 dynamic mode.) Stay tuned. ![]() Dynamic Inline Mode scales laser power to the stepper feedrate so that a consistent amount of laser energy is applied to the workpiece throughout moves, even as they accelerate and decelerate. Since Dynamic Inline Mode is new to Marlin (Oct 2021) it should still be considered under development and experimental. In these modes, power set with the S parameter doesn’t take effect right away, but applies on the next G1/ G2/ G3/ G5 move. These modes remain set M5 I returns to Standard Mode. M3 I enables Continuous Inline Mode and M4 I selects Dynamic Inline Mode. There are two inline modes, selected using M3/ M4 with the I parameter. Standard Mode can be used in combination with LASER_SYNCHRONOUS_M106_M107 (described below), and can be used to cut or to provide Spindle Feature operations when it is active. This mode is good enough for a spindle and is provided for backward compatibility. In Standard Mode the M3/ M4/ M5 commands wait synchronize the planner (causing a momentary stop) before changing the power. The default operating state for LASER_FEATURE is Standard Mode. Otherwise the cutter will simply be turned on full for any non-zero value and off for zero. ![]() ![]() A hardware-enabled PWM pin will provide the best results. If your spindle / laser accepts PWM signals for variable power levels enable the SPINDLE_LASER_USE_PWM option and define a SPINDLE_LASER_PWM_PIN. Laser features and other related options are enabled when LASER_FEATURE is defined in Configuration_adv.h. M306: Model predictive temperature control.
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