Douglas X-Y Calibration Test

thingiverse

This can calibrate printers in the x-y plane, as well as debugging over/under extrusion. Print this part, and use calipers to measure the outside dimension and inside dimension. The outside dimension should be 150mm, and the inside dimension should be 130mm. Adjust the steps on your printer to account for any inconsistencies. Below are the actual steps with examples: 1) Print part 2) Measure and record outer dimension (see picture) 3) Do the following equation: - OuterMultiplier = 150/outerDimension - Write down the value you calculated for OuterMultiplier - This tells us how much we need to scale our "Steps Per MM". A value of 1.00 means no change. - A value greater than 1 means we need to increase our steps per mm, which means that the overall part will grow if we print it again. - A value less than 1 means that we need to decrease our steps per mm, which means that the overall part will shrink if we print it again. 4) Measure the inner dimension (see picture) 5) Do the following equation - InnerMultiplier = 130/innerDimension - Record the value you calculated for innerDimension 6) Average your values - AverageMultiplier = (outerMultiplier + innerMultiplier) / 2 - This is what we'll scale our steps per mm by 7) Determine if there is over/under extrusion by doing the following equation - ExtrusionMultiplier = OuterMultiplier / innerMultiplier - If extrusion multiplier is greater than 1, that means that your part is too thin and needs more plastic. You will have to increase your flow rate, or increase the steps per mm for your extruder motor. - If ExtrusionMultiplier is less than 1, it means that your part is too thick, and you need to make it skinnier. Decrease your flow rate or decrease the steps per mm for your extruder. 8) Make changes to your "steps per mm" - This varies from printer to printer - Connect your printer to a computer via usb cable, and connect to it using a serial communication program (such as arduino, or putty) - Execute command M503 to dump printer configuration - Look for a line similar to this: Steps per unit: M92 X101.23 Y100.00 Z398.70 E100.00 - Multiply the value X (which is 101.23 in the example above) by AverageMultiplier - Use the M92 command to set X - Do this same process for Y - Do this same process for E, but multiply E by "Extrusion multiplier"