Universal Magnetic Hose Adapter

The adapter is designed to be as compact as possible and unobtrusive during use. It fits most tools in my workshop that do not produce large debris. It is compatible with the Festool hose, the DeWalt DCS438 saw, the DeWalt DCW604 router, and the DeWalt DCW210 sander.

The construction incorporates a galvanized steel washer M24 (DIN 125) with a diameter of 44 mm to close the magnetic field and enhance magnetic attraction. This allows the use of inexpensive neodymium magnets (2x6 or 3x6 mm) while achieving strong magnetic force. According to my tests, the adapter can withstand a pull force of up to 6 kg. It will also work without the washer, but the magnetic force will be halved. Note that the washer must be galvanized, as stainless steel has weak ferromagnetic properties.

The magnets should be arranged alternately with opposite poles: +-+-+-+-. This strengthens the hold and provides additional versatility: you can connect tools, hoses, and attachments at any end without worrying about polarity.

The height of the magnets does not affect the connection strength. I created different base variants to accommodate various magnet sizes for convenience.

The adapter consists of three parts that need to be 3D-printed using any plastic: the base, the inner insert, and the centering ring.

Base: file MC2 - Base x-hh.stl, where x is the height of the magnet, and hh is the height of the appropriate insert. The base is always the same, but the insert varies depending on the tool it is designed for. To make it easier to adapt the insert for your tool, I have included CAD files in the Step folder.

During assembly, the base and the insert are connected via a snap-fit joint. The base can also rotate relative to the insert, with distinct clicks felt during rotation. To make rotation smoother, you can apply a bit of thick grease to the joint. If rotation is not needed, you can secure the joint with glue.

The centering ring (MC2 - Ring.stl) is optional, but it increases strength, simplifies connection, and makes detaching the adapter easier with a simple twisting motion. The centering ring should always be on the hose side.