@o_lampe ok thx,i will start with default 500 and then test and change from there...

@o_lampe Thanks for clearing this out for me.
Do You think this part of the code is ok? or should I something change?

Hi,
I dont wont to make shorts on board and i didnt find what I am tryng make so i ask here for help and guidence...
I have custom made RRVcast 3 3d printer and recently i have bought Laser and will it to connect to printer so i can do engraving and small laser cutting eg.balsa2mm or making electronic boards ...
Laser is 5W 12 VDC 1.5-2Amp power request, with 5V PWM 5kHz
It has 3 pin for power and control it:
+12V
-Gnd
5V PWM 5kHz
My config is Duet 2 Wifi with Duex5 board on 24V supply.
First is it better to go with voltage regulator for droping down voltage from 24v to 12v ...it will be then GND shared with Duet/Duex...or to go with external 12 V supply...i have both and then do i need to connect GND with Duet/Duex for PWM to work or not?
If I can power it from external power supply and just connect PWM I would rather go that way, but if not posible i have also voltage droper.
Here is part of gcode for seting and controling laser...as stated from manual of Duex5 i can use PWM1-5 to control laser:
;;Controlling the laser

M950 P4 C"duex.pwm1" Q5000 ; create Laser on pin Duex5_pwm1_E2_pwm pin
M452 C"duex.pwm1" R50 S0 F5000 ; set Laser mode, C"name" Pin name(s) and optional inversion!, Rnnn The value of the S parameter in G1 commands that corresponds to full laser power, default 255, Sn 1= laser power is sticky across G1 commands, 0 (default) = laser is off when executing G1 commands that have no S parameter, Fnnn The PWM frequency used to drive the laser - default is 500Hz
; M571 P"duex.pwm1" F200 S255

Thank You for looking and help!

Thank You all... I have ordered them... now just to wait that they arrive and then some printing again

Thank You for sharing experience with me.

First one is from stepper online oms manufacturer and second one I found on ooznest.co.uk and it is motech stepper manufacturer. I olready use 3 of the osm 1.8 degree 1.68amps 54g-cm2 rotor inertia and 0.44Nm holding torgue and I can say only that they are good motors quiet cool running (I set them to work at 1.4amp 16microstep with interpolation) so I am kind to pick again same manufacturer... There are reviews of them all 5star and people using it on delta but on ooznest they listed those 2 other models from Motech but I can't find any review but as they are specialising in selling 3d printers and parts I think they know what are they selling so I am in dilemma now...

Thanks for helping me..

I so that post but what is bothering me is this inertia..how that impact perfomance?

Yes I am using 24V 24Amps power supply

Hi,
I have delta printer with Duet3d WiFi and OMC Nema 17 1.8 degrees motors 17HS16-2004S1 (2 Amp/2 VDC/1.1 Ohm/2.6 mH@1kHz/0.45 Nm/54 g-cm2 rotor inertia)
I wont to upgrade to Nema 17 0.9 degrees motors to increase resolution/precision
I have narrowed the choice to this 3 motor:
OMS 17HM19-2004S1 (2 Amp/2.8 VDC/1.4 Ohm/3 mH@1kHz/0.46 Nm/82g-cm2 rotor inertia)
MT-1704HSM168A (1.68 Amp/2.8 VDC/1.65 Ohm/2.8 mH@1kHz/0.44 Nm/68 g-cm2 rotor inertia)
MT-1703HSM168A (1.68Amp/2.8 VDC/1.65 Ohm/3.6 mH@1kHz/0.35 Nm/54g-cm2 rotor inertia)
Price is allmost the same at all three motors.
Please help me chose what is going to be the best upgrade.

Thank You all
Toni

Thank You !!!
Problem solved
I wont to express my gratitude towards You. Before I bought Duet3d I have read recensions about peoples experiences with different hardware and particularly important was to me support experience. I have post till now 2 questions that were a problem to me and You responded every time in a matter of hours and point me on right track to solve a problem. In this way, I wont to tell that I am more than satisfied buying Yours product and will for sure buy again. Thank You and don't change please, be like You are now.
Thank You !!!
Now on to my first print