How? I've made a badge, compiled it with the TF2 importer, and it works fine in TF2, previews perfectly in-game and loads in TF2 Modelviewer with no problems. I take all the necessary files and put them in usermod in SFM in the correct folder structure (I'm pretty sure: .mdl, .vtx, and .vvd in usermod\models\[itemname], .vmt and .vtfs in usermod\materials\models\[itemname]), and it doesn't work in SFM. If I try to load the item in SFM itself, it's invisible, except for the bone, if I try to load it with the hlmv.exe in SFM's \bin folder, I get 'error loading model.'

Is there a step I'm missing somewhere?