I don't know if its the machine (also from VEVOR), or just a bad batch of the blanks, but often the platic for badge splits, or the backs just dont press on at all. I would say out of the last set of blanks i ordered i had about 80% succses. I noticed i have some blanks left over and no plastic covers left so I dunno if the batch was bad and missing elements. I have just ordered my next set i will let you know.