I suspect it depends on how one uses the straight edge. IF you lean the tip on the straight edge it will suck heat. If you lean the iron away from the straight edge and use the tip to follow it you will be melting and cutting.
YMMV
HYOH
Free advice worth what you paid for it. ;-)
I started out using Husband's soldering gun (tip filed to a point). It was heavy and hard to control so I bought a woodburning tool at Michael's with a 40% off coupon. It's much easier to use. A wooden ruler with a thin metal edge works well to guide short cuts- for longer ones I use a wooden yardstick (don't linger as you cut or you'll burn the stick). My 6 foot aluminum rule sucks heat away too fast.
How do you (if you) clean the iron tips after you're finished cutting?
Occasionally during cutting, and immediately after a cut, I wipe it on an old cotton rag I keep handy.
www.dropbox.com/sc/5csc989pg913174/AAB_b0AamP5pNuErpWF5uDhRa
Of course, it helps that I get these free.
Lots of good advice. Thanks everyone.
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