@schiffer-soft , thank you, very inspiring !
Could you detail where you connected the lasers and which one you bought ?
I have my own power supply through the drag chains for the cross line lasers, because they need 3.3V. Find it on banggood ( link below ).
Unfortunately I have ordered the line lasers a bit expensive but cleanly installable for 19€ each at the following link. Module RED 5mW, adjustable Glass collimator:No, deflection angle:110° Miniature line laser Module 5mW Red 655nm Adjustable in focus and line position