I designed these "F" style clamps so that I could print my own clamps and make them as long as I like with 3/4" electrical conduit. A normal 36" clamp costs between $15 - $40. You can get a 10 foot piece of 3/4" EMT conduit for as little as $4.25.
I did a crude test to see what kind of force I can get out of these clamps and got an average of 180 lbs on a bathroom scale. The most I was able to get was 190 lbs; however, the parts did not break, I just couldn't twist the handle any further.
The "dead end" of the clamp uses a #6 screw (3/4 inches long) and nut as a set screw to hold onto the conduit. The "live end" of the clamp (the end with the 3d printed screw) has two versions: one with a 3d printed latch that clamps onto the conduit, and one with a set screw like the other end. They both seem to have similar holding strength.
The latch version of the live end uses a #10 screw (1-3/4 inch long) and lock-nut to hold the latch in place.
| Clamp-DeadEnd.stl | 539.8KB | |
| Clamp-LatchLiveEnd-catch.stl | 113.9KB | |
| Clamp-LatchLiveEnd-toggle.stl | 303.5KB | |
| Clamp-LatchLiveEnd.stl | 5.3MB | |
| Clamp-Screw.stl | 13.3MB | |
| Clamp-ScrewPad.stl | 1.4MB | |
| Clamp-SetScrewStyleLiveEnd.stl | 5.1MB | |
| Clamp_Dead_Side_v5.f3d | 181.9KB | |
| Clamp_Live_Side_v4.f3d | 586.2KB | |
| Clamp_Live_Side_w-clamp_v9.f3d | 1.2MB | |
| Clamp_Pad_v3.f3d | 166.6KB | |
| Clamp_Screw_v3.f3d | 3.4MB |
