Some pictures of my new low-cost “inlens-laserpointer”.
Motivation for this expansion: it’s very annoying adjusting the mirrors after some mechanical work or reassembling the head after cleaning the lens. Therefore I constructed a simple mechanism to bring a laserpointer into the ray path. All you need is a ballbearing from an old harddisk, a small laserpointer module, a 3V-battery with holder and toggle switch and a mounting block (I used an old 3d printerpart). The laserpointer has two positions, inside-path and outside-path, it can be toggled from the working side, no need to open the tube casing. I used a soft aluminium wire (1.5mm diameter) to adjust the laser and connect the lasermodule with the ballbearing. The ballbearing is practical without backlash, so you can exactly reposition the laser when needed. To mount the block, I had to drill a single hole.
The battery-holder including a switch is mounted with a doublesided tape. Adjusting the laserpointer is relatively easy: make a testshot to a paper, switch OFF the machine, toggle the laserpointer, switch on battery and bend the aluminium wire until you get the spot on the paper. Repeat it on all extreme positions. Once done, you everytime can readjust your mirrors or head without activating the CO2 laser.
Some more pictures are on my website http://johann.langhofer.net/lasercutter
That’s nifty. I like the design & position. Next step: motorise it so it can all be done with the press of a button 
@Yuusuf_Sallahuddin_Y Thank you. Well I had a motorized version (with a pull magnet, was working very well) but I removed it because for my need this “manual” version is sufficient enough and there is no cabeling, you even don’t need a powersupply to adjust 
@java_lang Yeah, I guess sometimes simpler is better. I just like the idea of pressing a button haha.
@Yuusuf_Sallahuddin_Y Anyway, you can press the button of the battery :)))))
@java_lang Haha, that’s true So problem solved. Thanks for the share. It’s a great idea.
Great mod ! Thanks for that
Thank you for this wicked idea…
Thats a nifty idea right there, will have to try this out sometime.
Great idea, thank you for sharing. When I have some time I will also make this handy addition! Do you think I can use a piece of aluminum bar instead of the plastic 3d printer part? Will aluminum near the tube affect the output of the big laser tube?
@Dennis_Luinstra Thank you. I think this has no influence because the mirror nearby also is a aluminium block.