I double-checked the description that this works with ALL Keurig coffee makers - "...the only reusable coffee filter approved for use in all Keurig® K-Cup® coffee makers."  Well it sure doesn't work with the Keurig® K-Duo Plus™ Coffee Maker with Single Serve K-Cup Pod & Carafe Brewer. Even if you remove K-Cup® pod holder - it won't fit. VERY disappointing and makes me want to return the coffee maker!