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i had problems with extruding at first , in my case, it was a the extruder motor pinion and filament guide assemly , the pinion as loose and it did not rotate, and the assembly was not aligned properly either, check your extruder pinion to see if it is locked in the correct position on the motor shaft
bed leveling is the most important i assume, also your limit y and z stop switched, you want to make it so that there is enough space between the nozzle and bed to fit in a single sheet of paper with a slight drag to it, at every point in the bed, meaning that you auto home the printer on the printer itself then proceed from there, starting with the Z stop switch (z is upwards and downwards movement of the carriage) , y is your bed back and forwrd, x is your carriage left and right , hope that helps , also your printer wont extrude until the nozzle is already at heating point , its a safeguard of the firmware , i use 210 temp for nozzle with pla, 70 degree bed works ok , you can go lower if small objects, also , try sanding your aluminum bed in a criss cross pattern (do this before leveling it) to help with first layer adhetion, and you can make a slurry with elmers glue and water if you still got problems spread a thin layer on bed , let it dry and print , hope that helps
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