Gweikecloud CO2 laser risers

I had to create some simple rizers for my Gweikecloud 55w CO2 laser. They fit snug under my machine and it helps when using bigger objects without the bottom tray.The new focus calculations are:For 1cm extra height (focus - 96.2mm - object height from ground)For 2.5cm extra height (focus - 111.2mm - object height from ground)For 5cm extra height (focus = 136.2mm - object height from ground)