Standard printed parts: https://www.thingiverse.com/thing:1021573
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Add Z-axis stabilisers to your setup > http://www.thingiverse.com/thing:1484501 http://www.thingiverse.com/thing:1431036
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Add rubber grommets/cut rubber piping to the corners of your heatbed to reduce bed judder
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Check if your prints are proper size with a caliper. ie. calibration box. Tighten your belt tension on all axes if that's not the case.
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Retighten all screws on your unit including beneath the heatbed belt mount (which can come off) if prints look wonky.
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Calibrate your E step throughput (guide here > https://www.matterhackers.com/articles/how-to-calibrate-your-extruder
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Adjust your retraction rate if prints look off
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Level your bed. Try to use a dedicated gauge for this
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Calibrate your lines and scale > http://www.thingiverse.com/thing:52946
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Print with the following settings: 190-200 degrees for nozzle and 60 for the bed for PLA. 0.2mm resolution 30% infill. Starting layer height 0.1, fan off for first layer.
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Add support or rafting if prints have problems
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Try materials from different makes/brands which may have different properties such as temperature and may work different to your setup.