This is a simple flexible (TPU) adapter for the vacuum cleaner for cleaning corners on the wall without leaving black marks.
The vacuum is brand Siemens and has the adapter fits the approx. 35 mm diameter of the handle.
Printed in TPU: Kimya TPU-R PE1019TQ.
But every TPU should do the trick.
I used three perimeters lines and 15% grid infill, a brim.
You'll find the FreeCAD file attached.
The author marked this model as their own original creation.