Giant Walking Machine
Finished, working model available for sale on Etsy: https://www.etsy.com/FullSizeRender/listing/1213170720/giant-humble-velocipede
If you'd like to print your own, note there are some big files here. Parts fit very tight, may need some sanding. Surprisingly strong once assembled.
Video: https://vimeo.com/channels/velocipede/236694973
Assembly instructions: http://www.instructables.com/id/Strandbeest-Inspired-3D-Printable-Walking-Machine/
Top bar - 3/8" aluminum rod
https://www.mcmaster.com/#90465k72/=19ns07g
Hip shafts - 1/8" steel rod
https://www.mcmaster.com/#89535K16
Joint pins - 1/8" x 1 7/8" spring pins
https://www.mcmaster.com/#90692a704/=19ziqrn