Weak Infill

The infill inside your 3D-printed part is crucial for the overall strength of the model. It connects the outer walls and supports the upper surfaces of the print. If your infill looks weak or stringy, adjusting some software settings can help strengthen this important area of your print.

Common Causes and Solutions:

Try Different Infill Patterns

One of the first things to check is the infill pattern being used. Some patterns provide greater strength than others. For example, Grid, Triangular, and Solid Honeycomb are known for their strength. Other patterns, such as Rectilinear and Fast Honeycomb, may prioritize speed over durability. If your infill is weak, try experimenting with different patterns to see if one improves strength.

Reduce Print Speed

Infill is often printed faster than other parts of the print. If printed too quickly, the extruder may struggle to keep up, leading to under-extrusion and weaker, stringy infill. If trying different patterns hasn’t improved your infill strength, consider lowering the print speed. For instance, if printing at 3600 mm/min (60 mm/s), try reducing that by 50% to see if the infill strengthens.

Increase Infill Extrusion Width

If the previous options haven’t worked, you can try modifying the infill's extrusion width. For example, you could print the outer walls with a finer 0.4mm extrusion width but use a thicker 0.8mm width for the infill. This creates more substantial infill lines, making your print stronger. Remember that increasing the extrusion width will use more plastic, so the software will space the infill lines further apart to maintain the same infill percentage. Many creators also choose to increase their infill percentage when adjusting the extrusion width for better results.