Grip wing for 1-Gang 18 cu. in. Round Old Work Electrical Box

I have a few 1-Gang 18 cu. in. Round Old Work Electrical Box mounted around my house. Few of them have a broken grip wing. To avoid buying new boxes every time, I created this grip wing that fits the box and looks almost the same as the original one.

Material: PLA Fill: I tried several levels of fills and didn't really see much difference.