Finished size is approximately 12 x 17.3 times bigger than your 3-round square (Sample is: 34.5”x53”)

Continuous Join-As-You-Go picture tutorial: https://www.ravelry.com/discuss/fantasticmio/4069169/1-25

Continuous Join-As-You-Go video tutorial:
https://www.youtube.com/watch?v=LO40rxGSxpM

This pattern was tested for colour blind accessibility by https://www.color-blindness.com/coblis-color-blindness-si... It will also still make sense when printed in the black/white setting on your printer.