Where to search for ideas and models

www.thingiverse.com/ portal with huge database of parts created for 3D printing, most of the models can be downloaded free of charge.

Markforged

www.markforged.com / Mark brand 3D printer – producer website

Průša

www.prusa3d.cz / website of the producer of the commercially most successful 3D printer

Miscellaneous

http://tvaroch.sk/ versatile provider of the 3D printing and related services, with lots of useful content

Miscellaneous

uprinting (courtesy of Eliza) a great guide to 3D printing! It really helped Eliza grasp a better understanding of 3D printing, so she thought it might be helpful for other beginners.