A customizable 3D printed stand-off using self-forming thread method described by Thomas Sanladerer in this article: https://toms3d.org/2025/01/14/a-better-way-to-add-threads-to-your-3d-prints/

I often use stand-off on circuit board and plastic is ideal for this application because it's non-conductive. It often contact PCB which can easily heat up to 80 C so please use PETG or ABS for this application if possible.