Take a PET bottle, cut off the top and screw the printed cap onto it. That's all you have to do to make a dust protector funnel for your power drill.

I have used @steffanders 's amazing PET cap models to design a base for a dust protector funnel we can use to protect ourselves from dust when we have to drill the ceilings.

The printed cap has a 10 mm long tube which holds the PET funnel in position properly.

I have exported caps for several drill sizes (4, 5, 6, 8, 10, 12, 14 mm). Also uploaded the Fusion 360 source file which is parametric so you can alter it to your needs.