Taking printing consumables as the starting point, observe the influence of multi-dimensional factors such as temperature, flow change, and pressure advance during printing on the final printing effect.
In order to optimize the printing parameters in a more scientific and meticulous manner, and finally achieve the purpose of optimizing the printing effect, this is the meaning of the existence of the calibration function.
We know that the printing effect of the consumables will be different under different nozzle temperatures, different flow states, and different pressure advances. Then, the process of observing and comparing the actual printing effect of consumables on these different surfaces is the process of consumables calibration. The different faces represent calibration dimensions. (listed below) 1. Temperature. (Under the premise of different printers and different consumables, by adjusting the temperature of the consumables, select the temperature of the consumables with the best printing effect.) 2. Coarse flow adjustment. (The broad and common flow ranges are listed, and their respective printing effects are integrated to prepare for further comparison and optimization.) 3. Flow fine adjustment. (Adjust and narrow the flow fine-tuning range more carefully, and filter out the flow adjustment difference for the best printing effect.) 4. Pressure advance. (Comparing the printing effects of different pressure advance scenes to adjust the relevant consumable application parameters) 5. Maximum volume flow (velocity). 6. VFA (vibration pattern).
The model used for temperature (nozzle temperature) calibration is made up of multiple stacked parts with the same structure. The principle of calibration is to use the same consumable to observe the actual effect of each layer of the component printed at different nozzle temperatures, observe and compare the printing effect of each layer after printing, and compare and screen according to the good or bad printing effect , so as to find the nozzle temperature (also can be understood as the consumable temperature) that is most suitable for the printing effect.
Based on the process of temperature calibration, we can finally analyze from the actual printing effect diagram that when the temperature of the consumable is 220°, the drawing problem is the lightest and the printing effect is the smoothest. Therefore, we use the temperature calibration function of the consumable to obtain The optimum printing temperature for this PLA filament is 220°C.
Note: (During the printing process, printing different blocks will use different flow parameters, the 9 flow parameters are [-20, -15, -10, -5, 0, 5, 10, 15, 20]. Flow parameters A value of 0 means 100% flow rate, a flow parameter of 20 means that the flow rate is expanded to 1.2 times the original, and a flow parameter of -20 means that the flow rate is reduced to 0.8 times the original.)
It can be seen from the printing results that when the flow parameter is 20, more consumables will be extruded, resulting in accumulation of consumables and rough surface. When the flow parameter is -20, the consumables will be under-extruded during the printing process, resulting in pores on the surface.
When the flow parameter is 5, the printing effect is better and the surface is smooth.
From this rough tuning of the flow, we get the flow extrusion percentage for the best print results.
Flow fine-tuning function entrance
Selection of fine adjustment calibration method (select the test model with the best printing effect after rough adjustment)
We assume that -3 is the flow percentage difference for the best printing effect of the current flow fine adjustment, then we can get the percentage difference according to the two flow calibration processes of coarse adjustment and fine adjustment: coarse adjustment: 5%; fine adjustment : -3%; the flow rate (flow percentage difference) for the best printing effect is 102%, and the calculation formula is detailed in the next section.
Fine-tune the calibration test model
Formula: Optimum Flow Ratio = Coarse Optimum Flow Ratio + Fine Tuning Optimal Flow Ratio + 100% Then we know that the calibration result of coarse adjustment is 5%, and the optimal flow ratio of fine adjustment is -3%, so 5% + (-3%) + 100% = 102%
Figure 1: Schematic diagram of the inlet for adjusting consumable parameters
Figure 2: Schematic diagram of adjusting consumable parameters according to the difference in flow percentage between coarse and fine adjustments
The klipper firmware optimizes the print quality at corners by introducing pressure compensation. The basic principle is to increase nozzle pressure during acceleration to extrude extra filament, and reduce nozzle pressure to retract filament during deceleration.
The parameter involved in the pressure compensation function is pressure_advance (subsequently referred to as PA). A larger PA value will cause overflow, and a smaller PA value will cause insufficient extrusion of consumables.
Therefore, there is an optimal PA value, and this parameter is related to the type of consumables, so it is highly recommended to re-measure the most appropriate PA value when changing the type of consumables. We provide two test methods, namely "PA tower" and "PA line".
When the "PA tower" test method is selected, by inputting the initial PA value, the end PA value, and the PA step distance, the slicing software will generate a cylindrical printing model with a pentagonal cross section. In the process of printing the model, the PA value will change linearly with the Z axis, that is, the PA value is equal to the starting PA value when printing the first layer, and the PA value is equal to the ending PA value when printing the last layer. After printing, observe and find the position with the best printing effect, measure its layer height,
According to the formula:
Starting PA: 0, every 5 floors is a step;
End PA: The test model has printed the PA of the last layer;
Calculate the optimal PA value, where Z is the layer height of the test model.
Set the PA range to compare the printing effect of different ranges
Stress advance PA test model gcode
Select "Maximum Volume Flow" in the "Calibration" tab, enter the three parameters of start flow, end flow, and flow step, and the slicing software will generate a print test model. By default, the starting flow is 2, the ending flow is 40, and the flow step is 0.5.
Maximum Flow Volume Calibration Function Inlet
Maximum flow volume calibration range setting (default)
Max flow volume calibration gcode
Analysis of the actual printing effect of the maximum volume flow rate
1. Result analysis: Because in the calibration comparison of the actual printing effect, we found that when the layer height is around 20mm, the printing effect will be worse as we go up, so we can conclude that the current value of 20 is the best printing effect, so we It can be concluded that the maximum flow volume is 20mm*0.5=10. 2. Parameter application:
Go to the consumables management module to modify the maximum volume velocity (flow) parameter value
Select "VFA" in the "Calibration" tab, input the three parameters of starting flow, ending flow, and flow step, and the slicing software will generate a print test model. By default, the starting flow is 40, the ending flow is 200, and the flow step is 10.
3.5.2 Calibration process (refer to the calibration process of pressure advance and maximum volume flow)
© 2014-2023 Shenzhen Chuangxiang 3D Technology Co., Ltd. Copyright
Feedback email: email@example.com