BEFORE tightening any of the screws on the top frame, loop the three timing belts over the flanged bearings in the top frame, between a pair of rods...
...down and around the GT 2 pulleys in the bottom frame.
Once the belt is loosely looped over the bearings and pulleys, pass the belt through the grooves of the carriage, around the top fixing peg on the carriage from right to left.
The belt should have enough slack to do so, otherwise check if the top frame is really as low as possible, but make sure you do NOT break the cables on the micro switches!
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