Downloads: Volumex DCOE adapter

I found a cad sketch I put together years ago of the face of the Volumex blower and a DCOE bolt pattern. I have been playing with 3D cad lately and decided to try to model this adapter.
Attached is my attempt at an STL file for this adapter, suitable for 3D printing. I had to ZIP it as the forum won't allow an STL file.
I'd suggest PLA is good for a fitup test only - a substantially more robust material would be required for use.
I no longer have my Volumex so I can't check it fits. Let me know if it needs tweaking.