Magnetic Filament Sensor Duet3D very accurately senses filament movement. Connect it to a Duet 2...HobbyStore
Silicone sock for E3D Volcano hotend
These socks will keep your nozzle clean and free of burnt on blackened plastic. They don’t just keep the nozzle clean, but also keep heat inside the hotend, and off the print.
Made of a heat-resistant, non-stick silicone material that will repel build-up of molten plastic. This really helps with sticky materials like Co-Polyesters and filled materials that like to build up on nozzles.
These also offer a huge boost in temperature stability, particularly if you use high airflow cooling around the nozzle to cool the print. The additional cooling combined with reduced radiation of heat from the block and nozzle to the print really boost the ability to print great overhangs and bridges, all while keeping the hotend temperature extremely stable.