There is a major difference between a self-wound bobbin and a professionally-wound prewound bobbin. Even among self-wound bobbins, there will be differences due to machine winding tension, speed, and size of thread.
Some ask, "Why would someone want a prewound bobbin. I just wind my own." The most common answer I hear is, "Oh honey! Let me tell you. It is an unbelievable convenience and you will never want to wind another bobbin! It is well worth the few pennies extra to have a professionally wound bobbin and they last a lot longer."
Here are yardage estimates:
L Style Bobbin (This style bobbin is compatible with about 70% of home machine models. To see the compatibility list, click HERE).
- Bottom Line: 60-80 yds. for self-wound; 118 yds. for SuperBOBs prewound bobbins.
- Masterpiece: 45-50 yds. for self-wound; 82 yds. for MasterPiece prewound bobbins.
- Brand X fuzzy cotton: 35-40 yds. for self-wound.
- So Fine: 50-60 yds. for self-wound. Not yet available on prewounds.
M Style Bobbin (for most longarm machines. see compatibility list HERE)
- Bottom Line: 120-160 yds. for self-wound; 215 yds. for SuperBOBs prewound bobbins.
- Masterpiece: 100-110 yds. for self-wound; 148 yds. for MasterPiece prewound bobbins.
- Brand X fuzzy cotton: 60-70 yds. for self-wound.
- So Fine: 80-100 yds. for self-wound. Not yet available on prewounds but they are in the plans.
*SuperBOB's. Cardboard-sided, premium polyester Bottom Line 60 wt. thread. Named after Bob.