My particular first world problem: it’s too easy to lose the cleaning disk that came with my coffee machine.
The item in question is just a plastic disk with a certain barcode. As I and many others have found, it is easy to print out a new barcode, tape the barcode to a used milk disk, and you are back up and running. Here is my contribution: said barcode in a PDF file ready for printing on Avery 5167 return address label sheets. Then, when you inevitably accidentally throw away your stand-in disk (which we have done a half dozen times so far), just peel off another label after your next latte.
If you have different label sheets, I recommend glabels3 to set up the template. The barcode value is “07879” using 2-of-5 interleaving (GNU barcode backend can generate these).
Update (03/2024):
Long ago this Tassimo bit the dust and it got replaced, bringing with it a new disk with a different barcode. Since this page still gets a lot of search traffic, here is an image of what that cleaning disk looks like in case any intrepid visitors need to reproduce it:
