Grab readme.pdf from here:

https://github.com/revzin/HWMToolkit

Made a bugreport https://steamhost.cn/steamcommunity_com/groups/BlenderSourceTools/discussions/0/385429254942050851/

Directly references to this: https://steamhost.cn/steamcommunity_com/groups/BlenderSourceTools/discussions/1/385429254939812081/

Recently I was figuring out of why BST can't import his DMX. Here is what Blender outputs:
http://i.imgur.com/cz9RlI7.png

After converting it from binary format to text format, I noticed that it contains "broken" symbols after "user" "string":
https://imgur.com/4WPKUhs

So, I changed this into something else and re-converted it back to binary. After that, it succeeded to import!

Here are DMX files if interested, they are just animations: https://drive.google.com/file/d/0B-_fPt0ZqEtNNGJBWUNGWjNDalk/view?usp=sharing

DMX can be converted using dmxconvert. Here is the guide on how to use it:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=551265085

Subscribed. Also i'm curious if it possible to import .pre files as well.

You probably applied Armature modifier for one of the parts accidentally. Check it.

The eyelashes' vtf-texture for SFM should have alpha channel, and $translucent 1 (or $alphatest 1) should be existing in eyelashes' vmt-file.

It doesn't matter how the model looks in blender, the BST only takes material's name, so you should set up material for source engine separately from from blender

引用自 I_AM_NOT_PUNCAKE：

@Zappy Would you be so nice to answer one more question of mine? So I have this texture applied to the arms, and it looks alright in "Textured Mode." But once I render it, the texture is misplaced somehow. Do you have any idea what might be causing it?

Set arms' texture mapping coordinates to UV so it will render properly.

There is a stripped top-right corner on 3D view. Press and hold it and drag it down. In upper new window switch into Text Editor, press New and paste the code above. Select your object, back it up and press Run Script.

Or try using this script. It removes exeeded weitghting on object's vertices. Select your mesh in Object Mode and run this script(I ussgest making reserve duplicate of object in case if you need to edit that):

# Purpose: Source supports 3 infuences per vertex
# this snippet will remove excess influences from the selected
# objects
import bpy

def removeExcessVtxFrom(obj, imax):
for v in obj.data.vertices:
if len(v.groups) > imax:
vgs = []
for vg in v.groups:
vgs += [(vg.weight, vg.group)]
vgs.sort()
diff = len(v.groups) - imax
vgs = vgs[:diff]
for (w,g) in vgs:
obj.vertex_groups[g].remove([v.index])

for o in bpy.context.selected_objects:
if o.type == 'MESH':
removeExcessVtxFrom(o, 3)
print ('Removed extra influences form', o.name)

Try exporting model into smd format if possible.