Modular Scrubbing Node Grid

This was inspired by this design
https://www.thingiverse.com/thing:863534

I wanted to make a modular design that was customisable and here is what i came up with.
This is not as flexible as i would like but it was a great exercise in parametric grid design .
Any openscad people can just replace the base module with whatever shape they want and they will be linked.

I have three different types of tops for different scrubbing surfaces. A smooth one, a bumpy one and a ridged one. You can choose any or all of them to be placed in a grid of your specifications.

Have fun and hack away at the code.
Let me know if you want any improvements or modifications.
//***** Update ******//
I updated the rides to print more clearly and adjusted the loops to have a base tolerance that should print without fusing the modules