I'd be curious to know what type of jig you used, if any, to keep multiple boards flat when edge gluing. For instance, in making a cutting board, many strips are edge glued at once. How do you ensure that the faces remain flat to each other when clamping, particularly with longer glue-ups.
I've seen some use simple cauls, one on top and one on the bottom, clamped together. I've tried this, but had trouble fumbling with the clamps and cauls, all the while losing time as the glue sets (maybe using a glue other than yellow would help with the open time?).
I am thinking a modification to Ed Nelson's clamps here could be a place to start.
Any jigs, tips, or techniques? How do you do it?