This is an gridfinity compatible enclosure for the LCR-T4 component testers that you often find on Amazon or Ebay, it is a rather cheap piece of hardware that tends to be handy for identifying transistors and other components. You can either use threaded inserts and just drill the holes in the base a little larger to set the threaded inserts or you can thread the holes directly with 4 M3x16mm screws. I also made this to accept a dc barrel jack in the bottom of the base which is linked below, if you decide to use this enclosure you will need to cut off the 9v battery adapter if your model has one and solder directly to the barrel jack. Once you have done that just place the pcb over the holes on the base, line up the face plate and put in the screws in the front plate and tighten. Happy Printing!
Link to dc barrel jacks used- https://www.amazon.com/gp/product/B091PS6XQ4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1