Calibration - slic3r/Slic3r GitHub Wiki

#Calibration

First make sure You have calibrated Your E-steps.. (a good source: Triffid hunters calibration guide)

A way to calibrate is to print an object as a single wall.

  1. 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)

  2. Enter your nozzle diameter (no need to measure, just enter the number you bought it as. Nozzle diameter only affects bridging.

  3. Set Filament Settings->Extrusion Multiplier = 1.

  4. Print the 20mm-box.stl file.

    • Set Print Settings->Infill->Infill % to 0.
    • Set Print Settings->Layers and Perimeters->Number of Perimeters = 1
    • Uncheck Print Settings->Layers and Perimeters->Detect Thin Walls
    • Set number of top and bottom solid layers = 0

  5. 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.)

  6. Now you have the theoretical Slic3r width and the measured width. Divide the Theoretical Value by the Measured value. If You had previously 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.

  7. Re-slice 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.