14mm to 18mm tube adapter

thingiverse

To create an adapter, use a simple 14mm to 18mm pipe connector. This item adapts pipes from 14mm to 18mm in size. In your slicer or Cura software, rotate the print so that the largest part is at the bottom of the object. To achieve optimal results, print with 100% infill and include a skirt for improved adhesion. Avoid using supports during the printing process.