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Your frame assembly should now look like the below picture.
Gather the remaining (2) 1450mm extrusions and install those
the same way you did the 1330 extrusions. Start by installing
the inside corner joiners on the ends of the 1450mm extrusion,
then slide them down into the legs.
Using positioning blocks can be helpful here as well to make
sure you have the 1450mm and the 1330mm extrusions on the
same plane.
Add drop in T nuts to the 1450mm extrusion, secure the
gussets to them using M5x8 machine screws, and put a final
torque on the inside corner joiners.
