This is a minor modification to gridfinity-rebuilt-openscad to add a nested circle infill, in answer to a request on https://old.reddit.com/r/gridfinity/comments/17v0zdy/looking_for_a_gridfinity_bin_similar_to_this/

see the gridfinity-rebuilt-openscad website for more complete information.

gridfinity-rebuilt-openscad is released under the M.I.T. license.
More documentation

To use, download all three .scad files, put them in the same folder, and open gridfinity-circle.scad with the OpenSCAD app.

In the file gridfinity-circle.scad the code:

//circle infill. intersection(){ translate([-circleDiameter*overlapPercentage*20,-circleDiameter*overlapPercentage*7,0])circleFill(); rounded_rectangle(gridx*length-0.5005-d_wall*2, gridy*length-0.5005-d_wall*2, 1000, r_f2); }

draws the infill. You could comment out everything else if you just wanted to nested circle infill.

Circle pattern from: /u/charely6.