Slice the cucumber between 1/8" and 1/4". Toss in a bowl with the vinegar and salt and mix until the cucumber slices are thoroughly coated.
For the Oven
If you're using your oven, spread the cucumber out on lightly greased parchment paper on a cookie sheet and bake at 170F for 3-4 hours or until crispy.
For the Dehydrator
If you're using your dehydrator, spread the cucumbers out on the racks and dry for 4-6 hours or until crispy. Dry time will vary depending on the humidity in your house.
Mix in other spices like pepper, cayenne, garlic, etc for different flavors. Be sure not to cut them too thin. I did that with a couple of mine and you can see that they didn't stay fully intact when they were done!