Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4613766.

Huanyang VFD Line Filter extension box created for my hy01d511b. Used M5 screws and nuts to mount the line filter, M2.5 screws and threaded inserts for mounting the supports (they only are to prevent the enclosure creating flex. To mount to the VFD I used the enclosure as a template for drilling holes into the VFD box using 4x M3 screws and 4x nyloc nuts to secure the enclosure to the Huanyang VFD. The strain relief screws in with M2 Screws and threaded inserts. If your Huanyang isn't genuine or you're unsure if it will fit I've provided a fitment test you can print to see if it will work before printing the whole thing.