I recommend cutting this file with MDF. Low end birch has glue voids and tends not to cut all the way through. It also never truly measures 1/8” or 1/4” all the way through. It also chars very easily.

Please be sure you measure your material to know which size stand to use. I have provided 15 different size stands measuring .11” to .26” I recommend owning digital calipers to measure your materials when owning a laser. Measure before you cut the stand so you know which one to choose. The kerf has already been done for you so no need to worry about knowing kerf for this file.