IFC guides and workflow tips?

[MFpsrig]

Hi, I'm working more and more with exported models in ifc for our projects, And it's working fairly well the models are sometimes way to big, like 250mb, compared to the whole house file which usually is aroud half of that... 

But to get to the point, does anyone know of any good guides on workflow and how to set up ifc files and models to work well for export. 

For example, I'm having a hard time understanding, and finding any good comprehensive guides on what IfcEntitys to use, (almost everything I do is custom objects, for example a hoist hanging in a motorised beam trolley) or our own lifting system. 

Do I just use Ifcproxy for everything since its custom. 

Does it matter if I set up every symbol with ifc data or is it better to to just select all and make that a symbol/group and attach ifc over the whole project. Does it affect the file size for example? 

 

Why should I use ifc 2x3 instead of 4 etc  etc.. 

 

It would be really nice if someone knows of any good guides or training examples. 

 

Thanks in advance.

[JuanP]

@MFpsrig try the following tutorial from the University:

 

Sharing your model with IFC