I needed to replace a perished hose which connects my water butts.  The original hose was 27mm plastic (measured as 26.6).  I had some 32 mm pond hose so I designed this adapter to screw onto the water butt joint and provide a friction fit for the new 32 mm hose.

I printed it in grey PETG with a 0.15mm layer height and it screwed smoothly onto the threaded joint.