My first ever model design. This is a simple water tube adapter designed to downsize an 8mm tube to a 4mm tube.

I have a low pressure water pump with an 8mm tube connection and I wanted to use it to provide water to a piece of lapidary equipment with a 4mm connection.

Step file included for those who may want to remix to different diameter connections.

I printed in PC with a 0.4mm nozzle, 0.08mm layer height and 100% infill. 10mm brim. No supports needed.

Works as I intended, so I'm very happy with it.