FILE MARKING:

1) Frame_C - Original model with back wall (solid/closed). Vertices: 922987 Polys: 1149549

2)Frame_O - Original model without back wall (open).Vertices: 702818 Polys: 691501

3)Frame_C_Lite - Model without grooves on the lines, closed. You can see the difference at the last image above. Vertices: 911662 Polys: 1138194

4)Frame_O_Lite - Model without grooves on the lines, open.Vertices: 678661 Polys: 667682

Please note that the model is detailed and may not be correctly reproduced on insufficiently accurate equipment. You can see a video demonstration of the correct slicing of the model in the slicer (Cura), but keep in mind that even as a solid, the model is not monolithic, but consists of many parts. Make sure this won't be a problem for your printer.