Thread Cone Adapter (33 mm to 28 mm)

This is a 3D-printed cone adapter designed to fit large industrial thread cones (outer base diameter ≈ 33 mm) onto standard home sewing machines that use smaller 28 mm mounts.

Key features:

• Dimensions: 33 mm → 28 mm taper, approx. 45 mm length (bore 7 mm).
• Fit: Snug and stable for both vertical and horizontal spool pins.
• Use case: Ideal for adapting over-sized thread cones to domestic sewing machines – helps the thread unwind smoothly without wobbling or falling off.
• Design: Simple cylindrical form with gradual inner taper for smooth seating and good filament strength.

In real life:

The adapter slides over the spool pin and allows the large thread cone to sit firmly in place (as shown in the photos). Works especially well with most entry-level or mid-range machines.