Contact
filamentcalcs.com is an independent utility site. For bug reports, wrong formulas, new calculator ideas, or anything else worth saying, you have two options.
Option 1: Email
Send to contact@filamentcalcs.com. This inbox is checked periodically (not daily) for formula corrections, bug reports, and calculator suggestions.
When reporting a formula issue, please include your printer model, slicer (Bambu Studio, PrusaSlicer, OrcaSlicer, etc.), and the specific numbers you entered. That makes diagnosis much faster.
Option 2: Public GitHub issue
For bug reports you want others to be able to see and reference, open a public issue:
Issues are public by default. Other users with the same question can find the answer, and the same bug doesn't get reported ten times.
Source code lives at github.com/SolidStone85/filamentcalcs. Pull requests welcome if you want to fix something yourself.