COSTCO Walmart Grocery Cart Folding Cup Holder

 UPDATE 10/29/25 - Added print profile for larger cups (90mm opening or about 3-½"). I also modified the hook arms very slightly, so they are easier to install onto the main body.

I really liked Livehack's design of the Costco cup holder that hooks onto the grocery cart however I discovered that our local Costco has a different design of cart than what their cup holder was designed for.  I improved Livehack's design by widening the hangar hooks to fit over the plastic rails on some Costco carts while still leaving a recess for the single wire frame design of other types of carts.  I tested this on Walmart carts as well and it fit great.  I wager it should fit a variety of other supermarket cart styles as well.

An additional feature of my design is it folds into a more collapsed orientation.  I also added detents to hold the hook arms in the folded position.  The included carabiner makes it extra convenient to hang on your shopping bag, purse, or whatever.