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Andrew,
You can use Modelcheck to output model size as a part or assembly parameter. The configurationwill look something like this:PRT_ADD_CHK_PARAM MODEL_SIZE OVERALL_SIZE
The parameter is created as a string with x, y, and z dimensions on one line.
model_size (string): ####.## x ####.## x ####.##
If you'd like, you can breakit into three parameters using relations. The relations would look like this:
mod_size_x = extract(model_size,1,7)
mod_size_y = extract(model_size,11,7)
mod_size_z = extract(model_size,21,7)