Large Thread Spool Adaptor

These are adaptors for using large spools of thread on a Singer sewing machine. There are tall versions that allow the thread to clear the bobbin when winding. Each size has one with a bulge and one without a bulge. The bulge is to create a tighter fit inside the spool. I have only printed the taller one with the bulge.

This requires minimum infill (10%-15% is plenty). I printed at .3 layer height and it came out nice.