This is an enclosure for a C14-sized IEC connector module with a switch & fuse.  This enclosure was designed for this specific model from Amazon: https://www.amazon.com/gp/product/B082ZFRV1B

The STL file will need to be rotated in order to print.  The part shown in the photo was printed in ABS on a Bambu Lab X1C.  An additional test part was printed in PLA on a P1P - neither print required support.

The mounting holes for the IEC module have enlarged bosses behind them in order to make it easy to install M3 heat set inserts.