dad said drywall anchors are too expensive so i copied and designed the one he had on hand in fusion 360. printed with PLA+ as well as PETG. both didnt work out. but are defintely better than the other 10 random ones i found online. you can edit it however you want to improve. i think it just was too thin. i never tested their strength. 
this is #8 drywall but i still dont know what that means. have fun!