Whatever you do: don’t print in PLA and also be careful of your clamps when machining. I printed one of these ages ago for my shapeoko 3 (I have a 3 phase spindle with er11 collet) and it was great for aluminium when using a small bit to keep things cool and free from chips!
I made the mistake of using PLA however and after a few hours of use the collet fan spontaneously exploded during a job… Luckily I had a spare which also exploded as it grazed one of my clamps!
I have never been more glad to have nice Polycarb doors on my cnc enclosure, those bits of plastic shrapnel hit the doors with quite a lot of force!
the file I used: https://www.thingiverse.com/thing:2207950
Also, I have found that using a collet fan when cutting wood on the shapeoko ends up with chips blown all over the rails and I have had my z axis jam because of this mid job.