Fenix Guthrie writes on Hackaday about a dog washing machine built by Stuff Made Here, which works like a drive-through car wash scaled down for a pet. An arch sprays the dog from oscillating nozzles that ride on linear rails driven by a DC motor. A second nozzle on the pods blows air to dry the dog, and an “undercarriage” nozzle runs in a channel underneath to get the mud off. The electronics are waterproofed and the AC supply is kept well away from the water.

The goal was to build it without metalworking tools. SLA 3D printing suited the parts, which have to hold up against water back pressure, and linkages connect the nozzles so their spray direction can be controlled. The arch itself is two bent conduits with welded legs.

That plan didn’t hold. A new CNC lathe arrived during the build and got used, and a plasma cutter made the grate under the undercarriage nozzle from sheet metal because sourcing one would have taken too long.…