Doodling in 3D - hot plastics 3D printing pens
Get experience with 3D printing without expensive 3D printer.
To be tones we have such tool for repairing in RepRap community for a longer time.
But 3doodler get much attention and there is many copies as product idea.
Generally positive is then you can get experience with 3D printing without expensive 3D printer.
Please look at and comment my other inspirations, I am actually
preparing for Ph.D. and you
build on hints are very valuable for me: