Quick XY Scaling Test

thingiverse

A quick test for testing the XY scale of your printer confirms its speed, printing under 10 minutes with a 20x20x20 frame that you can measure to verify and fine-tune the scale of models inside and out. Here are some useful things to know: * The model measures 20x20x20 mm on the outside, 15.2x15.2x15.2 mm on the inside, with every frame being 2.4 mm in width. Use these measurements to verify your printer's precision. Take a look at the third image for measurements. * A little dent on the bottom of the model in one corner allows you to easily pry it off the bed and tells you the orientation - it points towards negative X and Y. Refer to the third image on this upload for a better visualisation. * For fastest printing, print this with walls being 1.2 mm or more in width. This ensures that your printer prints out the model using straight lines instead of infill. * The model uses curved corners to speed up printing and minimize the possibility of overshooting sharp corners interfering with measurement. I have also included the Blender file for further editing. **HOW TO CALIBRATE:** To calibrate, you will need to know your current motor steps per mm. Find this value in your firmware or printer settings - let's call it `Old Steps`. Once you have it, print this model out and measure two values: * The X width of the whole model, around 20 mm - let's call it `Measured Width`. * The X width of one frame, which should be around 2.4 mm but expect a larger value due to squished in layers - let's call it `Measured Frame`. Enter these values into the following formula (don't change the value `17.6`, it is a constant): `New Steps = Old Steps * (17.6 / (Measured Width - Measured Frame))` Now, use the `New Steps` value for your calibrated motor steps! Use this formula to calculate both X and Y separately. Calculating like this should give you the correct inner and outer diameters on all models. Keep in mind that the outer and inner diameters will always be a bit wider and thinner respectively due to layer squish, which can be minimized by a smaller nozzle.