I needed something to help with the second mirror alignment and be able to hold some 25mm MDF circles, so I drew some profiles in Lightburn imported them into Tinkercad and extruded them to come up with this little gadget. It fits neatly into the laser head of four of my lasers and it’s quick and easy to change the wood discs as required.
Available here (free). https://www.thingiverse.com/thing:6990522
