Parabolic Lampshade for a Small Gooseneck Lamp

I have a small desktop lamp that took too many tumbles to the floor, and the original plastic lampshade cracked and was shedding broken pieces  This is a straightforward replacement that matches the original dimensions.

There is no brand name on the lamp, and I couldn't even tell you where and when I obtained it.  The only marking is a sticker on the underside -- see the attached photo if it might help.  Here are the dimensions of the lampshade, if it's going to be of use to anyone else:

Inner diameter (where the lampshade attaches to the lamp): 3.6 cm

Wall thickness: 2 mm

Height: 10 cm

Maximum diameter: 15 cm

Print with the narrow, flat end on the build plate.  No supports are needed.  I used PETG, but no reason PLA wouldn't work as well.