In November 2010 I started using homemade muslin coffee filters. I made two and lost one in the wash a few months ago. This afternoon I’ll make two more to replace the lost one and the one still in use. The remaining filter still does its job rather well, but after a year and a half of daily exposure to near-boiling water it has slowly but surely shrunk to the point where it no longer fits the machine well. I call this a success: essentially reusing five cents worth of coffee filters for 18 months straight. Not bad.