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This design is based on a toggle clamp and the difference is that the last part of the stroke is linear. As an example, this feature is useful for applications in which a probe must come in contact with a PCBA to test or program it. This is where I got the idea from. This design can be used like a normal toggle clamp because a fair amount of force can be applied at he end of the stroke and the clamp will hold just fine. I tried it with the kitchen scale and 3kg was not a problem but this was the maximum value of the scale.
This design consist of 16 parts (2× part 12) as can be seen in the PDF drawing. The linear stroke is as long as the slot in part 6 and 11 which is 10mm.
Printer: Creality CR-10
The thread of part 4, 5, 9 and 15 is a modified M8 trapezoidal thread with a pitch of 2.5mm. Regular M8 thread is to small to print. I recommend printing part 5 individually at a slightly lower temperature like 190°C and a layer height of 0.2mm and with a 8mm brim. You want to put as little heat as possible in this part. The infill of the axes, (part 1, 7 and 10) and the threaded parts (4, 5 and 15) is 100%. In other words, completely solid. This is not important for the other pieces.
The two 6mm holes of part 6 and 11 must be drilled afterwards to 6mm and the same goes for the 5mm hole of part 13 and 14. However, some have mentioned that drilling isn’t necessary. The parts 1, 7 and 10 are then pressed into these holes. I just did this with a hammer and a 6mm socket wrench. Don’t forget to place part 2 before mounting the axes. The rest speaks for itself.