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What factors can affect the printing accuracy of 3D printers

2024-04-11 12:01

3D printers cannot produce ideal high-precision models, and if you are a novice, you may not understand the reasons behind this. With the continuous popularity of 3D printers, more and more people can be exposed to 3D printing technology. If the printed model is not ideal and the accuracy is not high, these may be the reasons. Let's learn and learn together.

 

1. The accuracy of the 3D printer itself

When purchasing a 3D printer, we must first understand the printing accuracy of the machine, the manufacturing and assembly accuracy of the 3D printer, and the vibration during operation that will affect the 3D printing accuracy. The accuracy of a 3D printer depends on whether the walking part in the mechanical part is accurate and reasonable.

2. Nozzle diameter

The diameter of the nozzle also determines the width of the extruded thread, which can affect the accuracy of the finished product. Everyone knows that 3D printing constructs objects by stacking them layer by layer. Therefore, the layer thickness setting also affects the roughness of the finished product: using a large-diameter nozzle results in a thicker layer thickness. Although its 3D printing speed is faster, the finished product will be relatively rough; On the contrary, using a small diameter nozzle increases the 3D printing process time, but the finished product is more refined. The nozzle diameter is generally only 0.2mm, 0.3mm, or 0.4mm. The reason why it cannot be smaller is due to the non Newtonian fluid flow properties of the consumables. A too small diameter can lead to excessive flow resistance.

3. Extrusion speed and filling speed

When the filling speed is reasonably matched, the larger the extrusion speed, the wider the cross-sectional width of the extruded wire; When the extrusion speed increases to a certain value, the extruded thread may adhere to the outer conical surface of the nozzle, scratch the outer surface of the model, and affect the appearance. When the filling speed is faster than the extrusion speed, the material will experience wire breakage due to insufficient filling, making it difficult to form; On the contrary, the filling speed is slower than the extrusion speed, and the fuse is prone to accumulate on the nozzle, resulting in uneven material distribution on the forming surface and the appearance of bumps on the surface, which affects the printing quality. Therefore, the filling speed and extrusion speed should be within a reasonable range.

4. Nozzle temperature

The nozzle temperature determines the adhesion performance, stacking performance, wire flow, and extrusion line width of the material. Therefore, the nozzle temperature should not be too low or too high. Too low, the viscosity of the material increases, and the extrusion speed is slow; Too high, the material tends to be liquid, the viscosity coefficient decreases, the fluidity increases, and the extrusion is too fast to form precise and controllable filaments. Therefore, when setting the temperature of the nozzle, it should be selected within a certain range based on the characteristics of the selected metal wire to ensure that the extruded metal wire is in a molten flow state.