Building instructions for K'nex models are found on Knex.com, as of 2015. Printable instructions for all models are available to download for free in PDF format.
Find building instructions for K'nex models by navigating to Knex.com and then clicking "Building Instructions" near the bottom of the page. The website prompts to enter the five-digit model number or the K'nex Building set code and then click "Search Instructions." Links to download instructions in PDF format are displayed.
K'nex also provides general help for its models. Access building tips and other support by clicking "Building Help" on the homepage and "General Help" or "Product Help" on the next page.