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Changes to Step #20

Edit by Michael Hackney

Edit approved by Michael Hackney

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[title] Assemble the top
[* icon_reminder] The top assembles similar to the base triangleunit but is a little easier since there is only one cross member between corner brackets.
[* icon_reminder] The top assembles similar to the base triangleunit but is a little easier since there is only one cross member between corner brackets.
[* red] Lay out the three top assemblies on a flat surface with the labels facing up. Place the '''X''' assembly on your left, the '''Y''' assembly on your right and the '''Z''' assembly opposite you as shown in the first photo.
[* red] Starting with the rails attached to the '''Z''' assembly, slide them onto the '''Y''' assembly T-nuts''T-nuts'' until the first two T-nuts''T-nuts'' (one top and one bottom) are just hidden as shown in the second photo.
[* red] Starting with the rails attached to the '''Z''' assembly, slide them onto the '''Y''' assembly T-nuts''T-nuts'' until the first two T-nuts''T-nuts'' (one top and one bottom) are just hidden as shown in the second photo.
[* red] Repeat this for the other two sets of rails and corner brackets to form a loose triangle.
[* red] Carefully work clockwise around the top starting with the '''X''' assembly. Push each set of rails about 1cm (1/2") further into the corner bracket and move on to the next. Repeat this several times around until the rails reach the second set of T-nuts''T-nuts''.
[* red] Gently and carefully start the exposed T-nuts''T-nuts'' into their slots – but only push them half way in. Continue working clockwise until all T-nuts''T-nuts'' are started half way into their slots.
[* icon_note] A small screw driver is handy to align the T-nuts with''T-nuts ''with the slot. This step and the next are also a lot easier with two people to wiggle, jiggle and push the T-nuts''T-nuts'' into the slots.
[* red] Carefully work clockwise around the top starting with the '''X''' assembly. Push each set of rails about 1cm (1/2") further into the corner bracket and move on to the next. Repeat this several times around until the rails reach the second set of T-nuts''T-nuts''.
[* red] Gently and carefully start the exposed T-nuts''T-nuts'' into their slots – but only push them half way in. Continue working clockwise until all T-nuts''T-nuts'' are started half way into their slots.
[* icon_note] A small screw driver is handy to align the T-nuts with''T-nuts ''with the slot. This step and the next are also a lot easier with two people to wiggle, jiggle and push the T-nuts''T-nuts'' into the slots.
[* red] Finally, push all of the rails until they seat against the corner bracket. It helps to++ gently snug++ the twelve screws nearest the stepper motors to help hold the assembly together.