Use the online tool at https://www.doakey.com/resources/Public/LasercutHolsters to enter the length, width, and height of your holster. Edit other parameters such as the height of the sheet you are cutting. Then download your G-code and cut. Source code for the web page is available at: https://github.com/doakey3/doakey3.github.io/tree/main/resources/Public/LasercutHolsters