SummaryThis week, I upgraded the MK8 extruder in my Wanhao Duplicator 4X to the MK9 version, with a kit purchased from ultimate3dprintingstore.com Unfortunately, when I tried to put the top cover plate, I noticed that it didn't fit anymore! The new extruder has a "bulge" at the top that doesn't allow the original plate to attach properly, resulting in a loose piece that might fall down during printing. The piece (sold separately!) costs $15 for the plastic version and $30 for the aluminium one. So, I decided to search in Thingiverse, and although I found a lot of innovative designs, none of them could fit in my 3D printer: The holes for the screws and filament guides didn't line up properly, or the size was too big. In the end, I decided to make my own, and I'm sharing it in the hopes that it might help someone in a similar situation. If you need this part for a quick replacement, use the following settings: ABS, 10% infill No raft, no supports Bed temperature: 110°C 5 solid top layers 2 outer shells And it should print in an hour or less, with enough strength to be reliable. If you want to use it as a permanent part of your printer, increase the infill to 20% and the solid layers to 10, both in the top and the bottom.Print SettingsPrinter: Wanhao Duplicator 4Rafts: NoSupports: NoResolution: 0.2mmInfill: 10