This is a replacement handle for a "Blackout and Light Filtering Cordless Cellular Shade" from HomeDepot.

Here's a link to the specific family of products that I made this with in mind: https://www.homedepot.ca/product/home-decorators-collection-48-inch-w-x-72-inch-l-2-in-1-blackout-and-light-filtering-cordless-cellular-shade-in-white/1000827564

I recommend you print it sitting on one of the ends so you don't have to worry about overhangs.

How I Designed This

Fusion360 for the win