you will need an A3 printing paper with the plan printed on it. The plan can be downloaded as PDF from the attachment here. A4 should work too, though I havent tried. Smaller makes it difficult to work with.
1)Print the plan on A3 printing paper. Cut the legs plan out , fold at the markers, back and forth to make easy hinge points.
Fold and stick the appropriate portions as per the hand drawn plan, matching the section numbers in the drawing with the section numbers in the printed plan. Now you have the legs. Make all eight of them.
Step 1: Make the Camshaft with the sturdy hubs
2) use a nose plier to make the camshaft with each element being just wide enough to accomodate the width of the legs with the refill hubs. cut the empty plastic pen refiller to make the hubs. cut lengthwise through one side of the refiller pieces to make a slot through which you could insert them nto the cam already created. at the beginning of the lengthwise slit, you may add a V-cut to make it easier to push it in without much force. Use the supersharp surgical type blade to cut through. The radius of the cam must be the distance from the point of insertion of the cam into the frame (as explained in a later step) till the edge of the frame section which says "m".
The CAM has 6 sections, each successive one at 120 degrees offset to the next. Thus it have three alligned pairs of sections. This allows to have atleast two pairs of legs supporting and moving the mechanism in sync all the time, thus making it stable.
Note: The sections labeled L/2 should have been L actually. Its a typo. There is no mistake in the plan itself. Only a labeling mistake.thanks.