Originally Posted by pieces
I've always sewn with my thread in the upright postion and never had a problem. Even my multithread holder for my machine embroider is upright. I didn't know there was thread made to be used only in the horizontal position. (?)
If the thread is cross wound onto the spool, it's meant to come off the end. If it is stacked wound, doesn't cross over itself, it's meant to come off the side of the spool. Most of the time it's not critical if it comes off the side. The only threads I know of that it's critical to use them either horizontal or vertical are metalics and invisibles.