The job
What must the object do, hold, fit, survive, express, or replace?
Custom lab / browser-local tool
Prepare a practical brief from what you already know. Nothing is sent from this page; chosen file contents stay local.
What happens here
Before production
What must the object do, hold, fit, survive, express, or replace?
Known dimensions, mating parts, movement, load, temperature, and indoor or outdoor use.
A sketch, reference, model, photo, or measurements—plus what must not change.
Only share files and references you have the right to use, under terms you understand.