here it is: modelsplitter.zip ~ 45kb

just drag the model you want to split onto the exe in the explorer! each group of the model will be exported as separate model then.

notes:

• it is only compatible with 3dgs 6.4 or above
  
• the mdl7 format stores no transformation information but just raw vertex coordinates so in wed the split models will have 0 0 0 rotation, 1 1 1 scale and i set their position to the mean of the groups vertices
  
• it probably won't handle models with embedded shaders (didn't care about that)
  
• i haven't tested it with models with external textures but this shouldn't be a problem
  

i hope it's helpful!