2nd laser head on 1 axis

[g0rg]

I actually use this is my config.g for my laser diode to work and it works well :

M452 C"exp.heater3" F100 ; laser uses heater3 pin,  PWM frequency 100Hz

My questions are

• How to setup a second laser head in the same axis ?
• Do i need to setup tools for that purpose ?
• Can i set M452 2 times

The purpose is to send the same ttl signal through 2 outputs in order to "clone" an engraving job on 2 lasers in the same time
No need of an idex system, it's just a second laser head aside the 1st one