I am looking for a macro that will change units from inches to metric and than back again. also one that will dxf every piece part of an assembly.
Are you looking to just change the system units? Or are you looking to scale your part?
change the system units.
Why would you need to change the units to metric and back to inches?
Are you looking for a toggle?
What are you planning to do in-between the switch back?
Check the codes here : SW 2009 inch to metric macro
Are you looking to just change the system units? Or are you looking to scale your part?