I needed an adaptor connect the outlet of a washing machine and tumble dryer to a single drain. The ones at the hardware store didn't match my pipe fittings and were nearly £20!. Printed one in PLA using 17g of filament.

• top opening - 23mm inner diameter. 25mm outer diameter.
• small opening - 13.5mm inner diameter. 15.5mm inner diameter.
• bottom opening - 27mm inner diameter. 29mm outer diameter.

Measure your own drain pipe and hoses to ensure a proper fit. Fusion360 .3mf file included to allow modification of sketch geometry.