Trellace-Netting Smooth Support

## Basic Info
I have a trellace made of electrical conduit for some grapes. We also have japanese beetles in this area, and they love grape leaves. I put up some thin insect netting (if I get the timing right) to keep the beetles away and hopefully get some grapes. It has a tendency however to scrape on pointy bits of grapevine or sharp edges of the conduit & supporting structure. These are just a way of keeping the netting up off that trellace and prevent punctures/rips.

There's decent parameterization here, which you can see in the 80:20mm and 50:15mm versions provided. Happy to see how any other variations work well for folks.

## Precautions
With the right tie-in, friction might do you fine for keeping these supports in place. As you can see in the images here, I've got fencing hanging down (will bring some tomatoes up toward the grapes) that I can use to keep them in place on one side of this grape vine, but I think friction should be enough in most cases.

I've printed the "sup