I liked the concept of the python hook, but once I got one, I found it did not remove as much water from my tank as I would like. I created the above extension to get a 29 gallon tank to about a 40-50% water change. 

I printed in PETG since I believe it is safer for the aquatic life. Please be careful when using 3d prints in a fish tank; material type does matter. Please do your research. 

For settings, you shouldn't need much. no supports. I would recommend a brim to keep it from pulling off the bed. 

The extension should be a friction fit, but your mileage may vary.

Now that I am have the hook, I would recommend dIYing one from pvc so you could customize the depth. However, if you're reading this, I am probably too late. Hope this helps.