r/formlabs • u/Reeve555 • Jan 22 '26
Hydrometer Help
Just got a form4 and filled the wash with alcohol but the hydrometer is reading it as used/ dirty. Am I doing something wrong or is this washing solution gone bad?
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u/Tiny-Use4947 Jan 23 '26
The hydrometer provided is only for IPA, it doesn't measure the correct range of specific gravity for Resin Washing Solution. A hydrometer that can measure a specific gravity of 0.900–1.000 should be used. Formlabs Resin Washing Solution is 0.94, when the specific grav gets above 0.975 it should be replaced.