My girlfriend's French press somehow lost its handle. This is a simple replacement I knocked together. It should be adaptable to others of about the same size; this one has a slot in the bottom that hooks on to the lower part of the frame and a hole up top that clears an M5x20 screw.
It should go without saying that you want to use a heat-resistant material for this. Mine was printed in MG Chemicals red ABS because I happened to have a roll of it sitting near the printer.
The author marked this model as their own original creation.