A peace to put on your Vacuum cleaner to avoid contamination with drill dust.
Sucks away directly at the borehole.
Pay attention to the power setting of the vacuum cleaner one can easily peel of the wallpaper.
Set the Power to the lowest setting so the dust collector sticks to the wall and doesn't move.

To fit it to your own device:
There are a Parameter section around line 66.
// === Fitting ===
 

And a Test print Area around line 123.
// ==================================
// = Test Fitting of Printets Sub Parts =
// ==================================
were you can print slices and subsections of the part to test the fitting and not waste Time and Material.
use “//” to comment out
use “!” to tell openSCAD to only use that module.
Put the “//” and “!” in front of the line where the module is called.

//HOOSE_FIT_TESTER (); → is commented out
!HOOSE_FIT_TESTER (); → Only that module is calculated.

to get a STL out of openSCAD press F6 and File/Export the STL.
 

Print instruktions:
I set Prusa to make a Draft. Time needed 6.5h
Print it up right on the Ring where the hose will fit.
I used a brim with 0.0mm distance.
Only the hose section will need Support.

 The Actual Parameters fit to the hose of a Kärcher WD6 P Vacuum cleaner.

// === Fitting ===

VacuumFittingDiameter=35.5;             // smaler diameter of the hose at the end
VacuumFittingDiameterNeck=35.95;        // Diameter at the Neck of the hose
VacuumFittingLength=35;                 // length of the zylinder shape
VacuumFittingTaper_Factor=1.00625;      // for fine tuning to make a snug fit
VacuumFittingWallThickness=10;          // Actualy is half of that