Microscopy Objective Model for testing of size, space and in CAD designs. Our modifiable design is public on OnShape: https://cad.onshape.com/documents/a004177df839d7b925bb490c/w/dafa0d962bee45805c23691c/e/96bf6445e8b0930cc411cfd0?renderMode=0&uiState=64a43e4b0a7bc061500856a0

We mainly use this model in CAD designs as a place holder for a real microscopy objective (which is not printed).