My wife has a great collection of things for crafting, but very few crochet hooks. She asked me to pick up a J sized hook from the store. I countered by offering to print one for her. This is the result.

There are a number of improvements that could be made, particularly around making it parametric, but it does appear to be functional, as my wife is crocheting with it as I type this.

If you're printing on a ToM HBP you may want to orient it diagonally, so as to not crash your print head into the bolts. Otherwise, you just need to hit print.