Focus pedestal for K40 chinese ebay laser cutter

The focus of my K40 chinese laser cutter is about 37.5-40mm. If I want to cut or engrave acrylic glass I have to rais it about 1.5cm from the bottom to get into focus. This little pedestal is about 1.5cm high and should do the job. Unfortunately not customizable but it was easy to design so no big deal for you to do your own with differnt heights.