Adjustable Focusing Stick for Laser Engraving

This is my adjustable focusing stick that I use with my fiber laser. The 3mf files include three parts:

• 10cm wide top end of stick 
• 15cm long bottom end of stick (short version)
• 20cm long bottom end of stick (long version) 

The short version is ok up about 27cm and the long version about 32cm.

You will need two M3x6mm screws and nuts to attach the top and bottom parts. 
the heads of the screws can partially sink into the bottom parts and the nuts sink into the guide rail on the top part.

Happy printing and happy engraving :-)