I designed my own version of 3D Tic Tac Toe in OpenSCAD. You can make changes to the .scad file to control all the different sizes, margins, padding, tolerances, etc. I copied most of the main design elements from https://www.thingiverse.com/thing:6171473 but wrote all the code from scratch. I designed tubes for the "O" pieces instead of spheres.

Print list:

* 1x base
* 9x poles
* 14x X pieces
* 14x O pieces

I added holes to the base plates, so you can print all the poles separately. I recommend printing the poles horizontally with some supports, because this makes them much stronger. (They can be very brittle and snap easily if you print them vertically.) You could even buy some wooden dowel rods from the hardware store, or maybe some metal tubes. You don't need to worry about buying some cylinder with the perfect matching radius - just tweak the radius variable and everything will be adjusted to fit.