We have the year 2021 and ingenious technology to quickly make a sketch. For example, pen and paper. Paper has existed in China for about 2000 years and spread from there all over the world, pen-like things much longer.
Somewhat removed from this proven technology, our technical sketches with these tools do not look quite as smooth as we know it from computer-generated illustrations. Often this doesn’t have to be the case, for example, when the technical writer wants to clarify something in a research meeting or when a technical illustrator designs the graphics to be created.
But it doesn’t have to be a problem, with sketch paper for projections according to ISO 5456-3, projected illustrations also succeed with ease.
Sketch paper for download
If you like it even more traditional, take a piece of coal and a nice smooth rock wall.