Model Calibration – XYZ Axial calibration

This calibration process is used to improve dimensional accuracy for a specific model. When a printed object was found to be deviating from it theoretical dimension, we can use this method to correct deviation and achieve better precision.

Lets say we printed a cube with theoretical dimension of 80 mm x 80 mm x 80 mm, which you can check anytime by left click on the model. When measured with a caliper, we found that the actually size is a little off from the theoretical size. To correct the dimensional error, go to “Calibrate” -> “Model Calibration”-> Fill in the M1 column with “Actual Value” measured and enter The “Theoretical Value” of the cube into the S1 column.

Click “Confirm.” then the software will save the values and adjust printing parameters to correct for deviation.

XYZ axial calibration


Also Keep in mind that the calibration is only valid for the model used in the calibration process. So when printing another model, you may need to redo the axial calibration for the new model to archive maximum dimensional precision.

By Jason

Model Calibration – Vertical Calibration

Model Calibration – Vertical Calibration
HOWTO: Vertical calibration

In our latest UP Studio software, we brought back one of the most wanted features, Vertical Calibration, whose main purpose is to ensure all three axis perpendicular to each other in order to guarantee consistent high quality prints.

UP Studio achieves the vertical calibration by printing a special STL model, VC.stl, that you can download it from our website here. Make sure to uncheck the “No Support” and “No Raft” options, and you do not need to resize the model for different UP 3D Printer. It was designed to fit all the UP 3D Printers.

The recommended z-axis resolution setting for the VC.stl is 0.2 mm or 0.25 mm.

UP Studio

Figure 1 Vertical Calibration

After the print is finished, you can take out the build plate, but don’t remove the object if you are using an UP BOX+ or UP mini 2.

In the software, find the “Vertical Calibration” under Calibration. Click “Default”, before entering any new values into the edit fields.

Use a thin ruler or a vernier scale to measure the diagonal length of the model (from the outer edge to the other outer edge) as shown in the figure below for X1. Then, do the same for X2.

The length of the two diagonals should be 124 mm.

Enter the value of X1 and X2 in the software.


Figure 2.1  Measuring X1 and X2

Figure 2.2 Entering X1 and X2

Figure 2.2 Entering X1 and X2







Click the ‘Confirm’ button to complete the XY axis calibration. The software will round those values to the nearest tenth.

XZ calibration needs to measure the L-shaped model in the VC.stl print out. First, you need to remove the L-shaped from the build plate and peel off its raft, then find a right angle ruler as shown in the picture and push the ruler against the corner of the L-shaped, and measure the corner.

If the angle of the corner of the L-shaped is 90 degrees, enter ‘0’ in the Z value in the software. You can find the length of the L-shaped object now from the ruler, and enter the value in the H edit field. The designed value for H is 40mm.

Figure 3.1 Right Angle, Z value 0

Figure 3.1 Right Angle  Z value will be Zero.

Figure 3.2 Zero Z Value

Figure 3.2 Zero Z Value










If a gap between the ruler and the L-shaped object exists, as shown in figure 3.2 and 3.4, the value of the angle of the corner is not 90 degrees.

Use another ruler to measure the gap between the L-shaped and the first ruler as shown in figure 3.2 and 3.4. Enter the measured value with a minus sign as a negative value in the Z edit field if the gap is at the upper portion, like in figure 3.2; or enter the measured value in the Z edit field if the gap is at the lower portion as shown in figure 3.4.

Figure 3.2 Obtuse Angle, Z value will be negative.

Figure 3.3 Obtuse Angle, Z value will be negative.

Figure 3.3 Negative Z Value

Figure 3.4 Negative Z Value










Figure 3.3 Actue Angle

Figure 3.5 Acute Angle, Z value will be positive.

Figure 3.6 Positive Z Value

Figure 3.6 Positive Z Value










In our case, for figure 3.2, the value of Z entered is -1.5mm, and for figure 3.4, it is 1.5.

To finish the calibration, do not forget to click the “Confirm” button before you close the dialog.

If any error message appears, please contact us directly: for further assistance.