Using the 3D Builder download tool, I am not able to get a copy of the file to show the plate.
Steps to replicate:
Go to https://typeractive.xyz/pages/build/corne-5col_choc Click 3DP + FR4 plate Click Download 3D file This will download a .glb file, which if opened in Blender, Fusion360, ETC, will not show the correct part.
I am probably doing something wrong, but please let me know if you get this working, as I want to print the case and plate
Build your perfect wireless Corne or Lily58 keyboard kit with MX or Choc switches in 3D with our customizer. No-soldering required kits available. Get everything you need in a few clicks, and see exactly what it'll look like when you're done.