Lenovo Thinkcentre m720q/m920q case mod for GPU

This is a remix of the excellent case by domi-fresh. I have updated it to have larger replacable fan covers. This reduces the noise, and hopefully helps with airflow, and gives a different look. The grills will be quite tight, but have a little dome to them when pushed in. 

I  printed mine in PETG. 

The grills are printed using hexagonal infill with no top or bottom layers, so will show as solid in the preview, but will look correct after slicing