Infill is usually printed in a regular pattern, like in a grid, or boxes or even honeycomb structures. If you notice your infill printing deformed there’s a few things you can check.This may be one of those problems with 3D printing that you can live with, although it can be an early warning sign of worsening under extrusion.
Signs of deformed infill:
The pattern of infill appears deformed rather than printing evenly.
Explanation:
There may be some settings that aren’t quite correct which is causing deformed infill. If the structure chosen is not suitable extra support may be needed.
How to fix:
Infill printed too fast
With most slicers, the infill is printed at the highest print speed specified, while outlines for example are printed slower. So, the first place to notice too high print speeds is often the infill. Lower your print speed gradually to test if this fixes the issue as you might be printing too fast.
Decrease skip
You may have set the infill to skip layers. If the infill deforms, decrease the skip amount.
Increase infill extrusion width
Your infill extrusion width may be still be set at a reduced amount (if you were trying to save weight on a previous print). Set it to 100% (or higher) to see if that helps.
Insert diaphragm
Some slicers allow a solid diaphragm to be printed every so many layers. This can be used to support subsequent infill layers (and as a by-product, they can increase the rigidity of the structure significantly).
Print hotter
Try increasing the print temperature (in 5°C increments) printing faster requires increasing your print temperature to melt enough plastic in time.
Tighten belts & pulleys
Loose belts or pulleys could be responsible for a printer’s inability to perform sharp directional changes at higher speeds, which could result in deformed infill patterns, especially if it consists of sharp angles. Tighten the belts & pulleys to stop this problem.