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grbl homing with NC switches can start out as something small but can become very tricky very fast. There are plenty of options within the firmware but getting a combination of settings right is critical. However with the correct wiring and right sequence of options in grbl can lead to flawless homing within minutes.
This is a laser driver based on Agastar’s original design usingSTMicroelectronics’ LED2001PHR high power LED driver. My design changes includes the use of more low-cost components, adds a optocoupler isolation for the PWM signal and the option to manually control the output current with a potentiometer.
If you are tired of using a hot air gun or a soldering iron for SMD components, building a reflow oven should be next on your list. Its very inexpensive and there is plenty of electronics that would help you build it.