Strange 5.3 slicing bug on my PC

[Ocariduc 0]

Help with a very strange bug after Cura version 5.1.1: the design is a simple block (block.jpg attached). Slicing with 25% infill in the new 5.3 gives the preview shown in block2.jpg: not the same block at all. The picture at a lower layer (block3.jpg) confirms it is not the right sliced version of the original design.

Now, using Cura 5.1.1 (the last version not showing the bug described above), picture block4.jpg shown the right sliced block. Pictures at 2 lower layers (block5 and block6) show how a right sliced design should be.

The problem does not replicate on my second PC. What could this be ?

Many thanks.

[ahoeben 2,010]

Hard to tell without a project file. (File -> Save project...)

 

It could be that your model is not manifold, and you have the "Remove all holes" setting enabled in Cura 5.1 but not in Cura 5.3. The "Remove all holes" setting is quite a blunt instrument, but it can have its uses in some cases. Just remember to turn it off again. The best approach is always to make sure your model is manifold.

[ahoeben 2,010]

Looking at the pictures again it could also be that you enabled the "Mold" setting. In that case, your model could be fine. Again, hard to tell for sure without seeing a project file.

[Ocariduc 0]

Many thanks ahoeben, you have found the solution. Mold was indeed activated by accident and this option carries over from update to update.