Instead of paying $25 for “Pro” slotted cups from Click & Grow, designed my own replacement to use with ¼" wicking cord.
The design has both a 1pc and 2pc design. I started with the 2pc design so it would be easier to feed the wicking cord, but I like the stability of the 1pc design better. The STL file includes both. I recommend using supports to keep a cleaner cup bottom, but if your printer has great bridging, you may not need them.
Link to ¼" wicking cord on Amazon
The author marked this model as their own original creation.