There are at least three different 'shapes' of cartridges for the 510 and 901 but they are really close to the same volume across all styles. The 510 and 901 are interchangeable but the better switch is the 901 for the 510 imo. 901 tend to run slightly larger and sometimes after heat and reheat, the 510 cart becomes loose and the 901 then fits better.
The 801 cart capacity is 3x + that of the 901 and 510, but the 901 and 510 are virtually the same.
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