Dot Occlusion Cover for Defender-XL?

Anyone know who makes one or have an .stl i could print? I checked OpticGuard & range panda, no dice. There’s a 3d printed occlusion cover on eBay for it but says for dry fire…and I have a hard time buying a 3d printed part for the price of an entire spool of filament.

Or does anyone have a more clever solution than my black athletic tape + masking tape? What do you guys use?