Assembling "Main PCB": Optic parts
At this step you should install optical parts - lens holder and laser.
Lens holder must be connected to the PCB by two screws.
Installed lens holder (with the lens installed):
Laser is looking so:
You need to make the laser holder at the 3D printer. 3D model is here: Link
Laser holder is looking so:
You need to place the laser into the laser holder and to fix it with glue.
Assembly is looking so:
Now you can install the laser holder to the PCB. It must be fixed at the PCB by two screws:
Solder the laser wires to the PCB (pads are marked: L-/L+).
Finally, install the lens to the lens holder.
Now you can do laser alignment: Link