Each tool here solves a specific problem I hit while building something else, and is free to use. Browser-only — nothing installs on your machine, nothing phones home.
Punch in your top-hat polyurethane bush dimensions. Download a printable STL — either the bush itself for TPU, or a dissolvable PVA mould you fill with polyurethane and dissolve in water. Live volume + grams calc for two-part PU mixing.
Coil-over spring rate calculator, dial-face PNG generator for the DigiDial gauges, and a TVR fuel-line union picker are all in the queue. Suggestions welcome via YouTube comments.