Idea – Practice Technical Drawing Using A Toy Draw Projector?

My drawing skills are very bad. So to improve this I came up with a simple aid tech technique.

Simply use Blender to create the 3D model. Then you could use a toy drawing projector to draw on the image and paper.

Visualizing is an important part of problem solving. The idea is that you get better at mathematics or physics by this kind of technical drawing practice.

So to improve my idea of a Pressure Taking Object In A Piston Cylinder. I made the following drawing from Blender 3D object and a drawing tablet with MyPaint.