I always get trouble closing ziploc bags so i decided to make a slider that works just like the zipper on the more expensive bags, except this one can be removed and used on other bags. Simple design. you may ave to trim the top flap of the bag a bit and its designed to be used with the double lock bags but should work just fine with the single lock bags as well. Slide it on from on top and squeeze very slightly to close the bag. Works like a charm!I printed @ 40% with t-glase PET but pla works just fine as well