This is a  Handle for  a metal wiper.

Inner diameter is 28.4 mm 
(So radius is 28.4/2) 

The wipers diameter was between 28.5 and 28.1 mm depending on how you pushed the metal

Height is 9 cm. 

Height for the test piece is 1.5 cm. (To test if the handle will fit) 

Printed in petg, with standard values. No support. 

Pattern i added with bumpmesh, if you want to add a different pattern. 

https://bumpmesh.com/