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New to linkages? For some easier builds like Punchers, Jumpers and Biters check out Linkage Warm Ups.
If you want to create a custom linkage for your walker like this simulation of Strandbeest's linkage optimized for LEGO, see Customize where you can find interactive simulators for Jansen's, Klann's, TrotBot's and Strider's linkages. Strider Ver 3's linkage plans can be found here. TrotBot's linkage plans can be found here. LEGO Builds
Mindstorms BuildsUPDATE: for improved functionality for Mindstorms Strider Ver 3, see these instructions for mounting the EV3 brick higher
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Strandbeest Optimized for LEGO
TrotBot Ver 1
Strider Ver 3
Trouble Shooting Tips: A finished walker's legs should be easy to rotate by hand with the motors disengaged. If you feel resistance, then look carefully at the legs to see if any are twisted due to leg parts connecting to other parts in the wrong plane . Also, make sure that all bushings have been added to the axles so that the legs and cranks don't collide. Most importantly, be sure to use frictionless pins for joints designed to move. 
LEGO Spot Micro training on his treadmill
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NEW - we've finally dialed in a solution for smoothing the gaits of 8-legged Striders by adding shock-absorbing heels:
Hiro Labo has shared some awesome step-by-step instructional videos - you can find them here:
Oracid continues to improve his speedy walker with 2 DOFs, and shares instructions below. He's also shared some analysis with us here on our blog
One of our latest builds is a LEGO Quadruped TrotBot which is based on Hexapod TrotBot with a frame side and a pair of legs removed, making it our easiest and cheapest TrotBot build.
Check out Grumo's awesome Klann build, featuring retractable spider silk for improved cookie hunting ability!