Motorhome/Campervan/RV Water Filler

Design & CAD

The design includes the capability to fill from a hose connection or from water containers via the funnel, allowing water filling even when too far away from the water point. I've used this system extensively throughout the UK and Europe and it has performed really well. The only extra part required is a simple Hozelock #2158 BSP threaded tap connector from your local DIY or garden store. I had originally included this as part of the Water Filler design itself, but after a period of use the tip of the connector would break — unfortunately a limitation of 3D printing.

The system is intended for RVs, motorhomes, and campervans with an 80mm water inlet — see the photograph below for the dimension. For storage and when travelling, all the parts can be stored within the funnel.

The system comprises 6 parts, as follows:

• Water filler — this simply rotates onto the water inlet; it's slightly loose to allow for tolerances in the moulding supplied by the vehicle manufacturer. For filling close to a water point, simply connect the Hozelock connector, then connect the hose, and you're good to go. Print with supports.
• BSP connector — this connector has a printed-in-place end piece to allow rotation of the part when connecting the funnel (see photograph with the see-through end piece). Removing the Hozelock connector and using this custom-designed connector instead allows the funnel to be fitted in the correct orientation. Print with supports, then remove from the printer bed and "crack" the end piece to free the support material, then remove all support material and clean the area.
• Funnel — when away from the water point, fitting the funnel to the BSP connector allows filling from water containers. Print with no supports required.
• Lid — used when filling remotely from the water point; simply screw onto the funnel to prevent debris and insects from entering while you're off collecting further containers of water. The lid is also used to keep all the parts together within the funnel. Print with no supports.
• Blank cap — protects the funnel end threads from damage during storage. Print with no supports.
• Tap washer — I decided to design and print my own washers; 3 are required for the system, though they can alternatively be purchased at a local DIY or garden store (Hozelock part). Print with no supports — I used Ninjaflex TPU for these parts.

I printed all the parts (except the washers) in Prusament PETG, Prusa Orange, and they all came out really well. Parts were printed with 4 perimeters and 40% infill.