Quote
hercek
[If you are afraid of that then it should be possible to modify it so that it works like capacitive displacement sensor. It would be more expensive though.
If expense was a concern, I would have picked up a $299 printer kit from Amazon instead of spending three times more than that for the best-of-breed parts and design. ;) I wonder if hotend heat would be an issue with a capacitive displacement setup?
My thought is to borrow a tip from the RAF's WW-II dam-buster bomber. They had to fly *real* low at night, so they put downward-pointing spotlights on two different parts of the plane aimed at angles. When the two light beams intersected on the water's surface, they were at the proper height to drop the bouncing bomb. Too high or too low meant that the light beams wouldn't touch. Anyway, with a laser shining down at a 45 degree angle focused just under the tip of the hotend on one side, and an optical pinhole sensor at a 45 degree angle on the other side looking for the laser reflection from the print surface, it should work the same way with no mechanical contacts or even touching the print surface required. In theory, anyway.....