Thanks to aleung for the idea, I made a remix to have the dust collector bigger than the drill guide to catch more dust. I profit to make it more compact and I added a guide for smaller drill
The big hole is 11mm, and with the guide it goes down to 6.5mm.
I also add a fillet to make the liaison between the plate and the drill's guide more stronger.
Also the little windows are now triangle for better precision, and the dust collector is without any angle to clean it up more easily.
I have a little artifact on the 2 corners, but I didn't find how to remove it yet
You have the .stp file included
I din't print it yet
Edit: Printed, so BE CARREFUL I didn't put enough space between dust collector and drill guide, so you must have long drill, I will make a new version with more space (see last picture)
Edit new version (v06) added with more room (dust collector angle increased)