Cap for a 70mm diameter cylinder, designed by me. I created it for easy attachment and detachment using the side tabs (which should be positioned externally). It’s mainly intended for sealing air ducts. 

Printing parameters that worked well for me: 

-7% infill

-3 wall lines

-PETG material, but i also tried PLA and it worked great

 I’m also including the STEP file in case you need to modify the size and adapt it. 

Happy printing to everyone! 😊