I had this idea of printing a adjustable HFT/FT style butt pad on a 3D Printer. While the idea is nothing new I couldn't find any 3D drawings or STL files of such a butt pad anywhere. I had a look around at all the different types of butt pads being sold and drew up a design that is simple and 3D printer friendly. When the design becomes too complex it becomes difficult and more costly to have it printed. I then sat with a friend, gave him a few rand for his troubles, and he converted it into 3D drawings in Inventor and then exported them as STL files. The photos below is the first one that was printed. The example is printed from ABS plastic and I am happy with the result. I plan on having another copy printed in polycarbonate which is a lot stronger and more durable than ABS. The paddle hinge pins are 4mm steel and the bolts that hold it together are standard 5mm bolts, purchased at Builders, and cut to size.
Both paddles can be adjusted inward and outward and the top paddle is also hight adjustable. The main body fits into a slider base and can be adjusted up and down and turned left and right to a maximum of 20 degrees from centre. In the photos you will see the bottom paddle has square edging but the edging dug into my skin because it was a little bit too wide. On the printed example I sawed the edging off to change the shape of the bottom paddle to a narrower triangle shape and it made all the difference. This can be seen in the last photo. I had this amended on the 3D drawings as well. The rubber grip areas are covered with 1mm (I think) rubber sheeting I have lying around and I still need to trim the rubber edging and clean it up a bit.
I have no need for a hook so I didn't include it in the initial example. The nice thing is that if I need/want a hook at a later stage the bottom paddle can be re-designed to incorporate that. Then all you have to do is print the new paddle only and bolt it to the rest of the assembly.