This isn't something to print it's an STL representation of an HicTop 3DP12 bed to go into the machine properties in Simplify 3D (e.g. Options -> Machine -> Add, select this STL).

If you want to customise for your own printer, it's available here:

https://cad.onshape.com/documents/aae739b9cccceb738e11c58b/w/a0c7ccb18196df85eeea3935/e/650642c7d46437ce9350a3ce