I make trellises similar to Jerry's except I just use metal conduit and whatever wire fencing I can find and hold it together with wire ties. I have never noticed the metal heating up enough to bother the cucumbers. I also make mine 7 feet tall with the wire stopping about a foot off the ground and even with this height they still will grow over the top. You just have to give them a little direction by sticking the growing tips through the fence wire openings to force them where you want them to grow.
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