I'm reprinting my accessories in fluorescent green and thought I would add the bed level graphic I've seen on other fan covers.
I've seen other covers with similar designs so while I did modify the original part this wasn't an original idea on my part. Also, remember this will be hidden under the build plate most of the time where it will be difficult to see. :(
I imported the original STL into SketchUp. I used the circle tool to create concentric circles then used line tool to remove lower segment and draw the arrows (. Used text tool for Down/Up text then push/pull tool to raise everything up 1mm. Finally, I exported the modified STL.
First black cover on the left, new green cover on the right.
Close up of graphic.
"Alexa, set the den lights to dark blue"... Bam! 3D Printer Rave!