The tool is a remix of the fantastic original model, which is super easy to print and works great.
It has been redesigned to fit Parkside (Lidl brand) AC Multi-Tool "Dremel" tool and adds additional features.

For small drill bits push the rotating disc fully into the tool holder.
For big drill bits move the rotating disc out a bit. See pics.

Can be used with a Cutting Disc or Grinding Disc for Sharpening.
For relief angle simply lift the drill bit on the other end.
The dust cover is removable.

V1:

• Made mounting thread compatible with PARKSIDE Multi-Tool (AC-plug)

• Added 2mm radius away from the rotating disc, for grinding more on the outside of the disc.

• Added bevels for no sharp edges

• Added a thumb groove to hold and rotate the drill bits

• Added a flat base for secure stand, even a hole for table mount

• Added a removable dust cover

• Added more material here and there to strengthen the construction
  

V2:

• Changed thread angle, so the on/off switch is on top.

• Made V-shaped drill holder 2mm higher and beveled edges for smooth rotation of bigger drill bits

• Dust cover easier install and catches more dust/sparks.
  
  

Printing:

No supports required, brim recommended.
For working screw mount thread i recommend to use only 0.2mm layer height AND use Adaptive Layer Height AND Adaptive Layer Smoothing. See pic. This setting makes perfect threads.
I guess PETG is better than PLA to avoid melting the removable dust cover by hot sparks.