Thank you Zax. Thanks to you I discover T2Laser. Also I do not know where are the GRBL parameters...
Can I change the laser module for a more powerfull one ? Which is the most powerfull for my A3 Pro ?

For example this one : https://www.banggood.com/fr/VIGOTEC-20W-New-Laser-Module-DIY-Kit-450nm-Professional-Continuous-Laser-Cutting-Engraving-Module-Blue-Light-For-Laser-Cutting-Engraving-Machine-CNC-DIY-Laser-Compatible-p-1735336.html?rmmds=detail-topright-recommendation&cur_warehouse=CN

I found and fixed the problem : it was only the connectors Y1 and Y2 to swap !

I am thinking to invert two connectors...
In the four wires there are the red, the yellow, the black and the white colors. My question is which colors lead for up and down for the two motors ?

Hello Zax (or someone else), after installing the new mother board, things became better. But I have some directions wrong again :

• UP - became - DOWN
• Down - became - Up
• Right is OK
• Left is OK
• Up Left -> Down Left
• Down Left -> Up Left
• Up Right -> Down Right
• Down Right -> Up Right

Any idea to solve it ? Thank you

Thank you Zax. Maybe I am not in the right forum here. I bought a new mother board. I will change it soon.

Hello EleksMaker team !
I have a big problem with directions control in EleksCam, or in LaserGRBL since I have downloaded the latest version of EleksCam and also VC Windows 64bits.
Before that, my A3 Pro worked very fine using Inkscape with J Tech Photonics Laser Tool extension and LaserGRBL. But around Christmas time, my A3 started to burn my design with some stranges waves like a child twisted draw. So I downloaded EleksCam and VC Windows 64bits to see if it was a software problem. And things became worst. Directions are completely mixed. I have removed all software from my computer (under Windows 10 Pro) including the USB driver. And then put again LaserGRBL with the USB driver. But nothing good !
Do you have any idea ? I am lost... Thanks a lot.

I have engraved a wooden revolver stock...

Which software do you recommand?

You can also find some good videos on Youtube!
Youtube Video

Did you try to uninstall Eleskcam and then install it again?