M Series GWEIKE Laser Fiber Focus adjust tool

Plastic style:

To be printed in a non-brittle, non-warping material, PETG and PLA+ are perfect.
On a good 3D printer with a good precision ... A millimeter must be a millimeter !

Print your tabs, along with the nut and bolt.
Don't rush; let your print bed and tabs cool completely before removing them from the bed, in order to limit warping.

Metal style:

Tanks to the dxf files attached, It is possible for you to cut the tabs in a sheet of 1 mm stainless steel or 1 mm aluminium, the Base, bolt and nut remain plastic.
Here again, millimeter must be a millimeter !
When I will have my Nestworks C500 I will publish the tabs (bed and 10) as well as the bolt and nuts to be milled in metal.

Assembly:

Stack the tabs on the bolt in the correct order !!!
Tighten the nut smoothly ... it's ready !

You can easily check the accuracy of your tool using a caliper. The bed tab needs to be exactly 7.4 mm thick, and is representing a focus of -6.

Using a 6mm Nylstop nut with a 6mm metal screw is a good option to maintain the same pressure over the tabs while rotating them, with out driving the nut rotation.

Three circular 10x3 mm magnets for the housing.
If using metal screw, one TH M6X40 mm and one TH M6 Nylstop.

Usage:

Select the desired focus value and stack all the tabs with the lower value. Stack the remaining tabs in the same way, at 180 degrees, or 90 degrees, or what ever you prefer.

Unscrew the focus locking screw, push the tool perpendicularly along the axis until you hear a click, then push the nozzle upwards so there are no gaps between the tabs, tighten the screw.
Finally remove the LFF tool from the laser head by sliding it horizontally on the right.
... you're done !

Enjoy !

Bonus :

Can also be used as a hand fan if you sweat while using your M series.

May the force of laser cutting be with you ! 
as well as the 3D printing one !