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Calibration
#Calibration
A way to calibrate is to print a single wall object, (like the ones that come with sfact.. e.g. _40x10.stl)
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Measure your filament and enter it (measure across multiple places using digital calipers and enter the average to 2 sig figs (2.8 or 1.7 respectfully)
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Enter your nozzle diameter (no need to measure, just enter the number you bought it as. Nozzle diameter only affects bridging.
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Set your Extrusion Multiplier to 1 before beginning this process
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Print the _40x10.STL file.
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Open the Gcode file and look for the value for single wall width. Take a note.
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Using Calipers measure the wall thickness of all 4 sides of the thin wall cube. Throw out the largest value, and average the other 3. (Be sure you measure from the top of the box, not the bottom, the bottom might be flared out because of the 1st layer not being perfectly level. Also if you have big variations it is a good idea to measure the side that is extruded last as the extrusion will have mostly stabilised by then (after the Z-move). Try to measure the smallest number of layers possible from top as the slightest vertical misalignment of your layers will increase the measured value. Ideally a single layer would be best but very difficult with regular calipers. (Make sure the measuring device is not biting into the filament during measurement.)
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Now you have the theoretical Slic3r width and the measured width. Square both values. Divide the Theoretical Value square by the Measured value square. If You had prviously 1 in extrusion multiplier then just enter this value. If You had some other value there before then multiply this value with the just obtained value and enter the Result into Extrusion multiplier.
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Re-Slic3e and Re-Print the file with the new value. Remeasure. It should be spot on. If not You can iterate (repeat the process with the enetered value).
Note: You can interrupt and measure the print as soon as you feel the extrusion has stabilised (is printing consistently).
Do not forget to save Your calibration settings.