This handle can be used with many different types of tools. It is ideal for things that turn like a screwdriver or you need to press and or pull with like a file. I use this with a file I purchased for plastic, but it is for sure not limited to that. The threads were put there to help prevent the tool from pulling out. I typically fill the hole about half full of epoxy and press the tool in. I then fill as needed.

The threads for the largest handle are M10 x 1.5. They run 65mm into the handle. The other handles are just scaled down 10% each so will not likely work with any threaded items.

I print everything with PETG. I think this would be interesting with one of the harder types of TPU. I am sure any of the high temp filaments would be superior as far as strength. I did 10 walls and 50 top and bottom layers. I used tri-hexagonal infill at 50%. I wanted it to be very strong with a little give. I also didn't want the end of the tool pushing through the plastic into my hand.