This soap dish is big enough to house a full size bar of Dr. Squatch Soap, or similar sized bars. I would recommend printing out of higher temp material such as PETG to prevent chance of warping due to heat and make cleaning easier.
For added fun, print the two parts out of different colors.
Tolerances are modeled in and I included a “loose fit” version if your printer isn't spot on. I haven't had a chance to print one myself yet so please share some makes! Happy printing and happy bathing!