Why is there is a limit of a 1km box in DesignModeler and Simulation?
For most structural/thermal solutions this is not a major problem. However, for a MEMS device it is common to
use micro or nano length units (which are presented as meters to Parasolid to avoid Parasolid converting them
back to meters.) This can easily result in dimensions greater than 500.

This is a limit in Parasolid. The 1000 meter limit is centered at the origin, so a model dimension cannot exceed
500 meters in any direction. Simulation uses the Parasolid engine during an IGES import, so the 1000 meter limit
applies there also. Under these circumstances it may be necessary to use a some what large length unit than
normal, such as millimeters.

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