RC2+ Program crash when using raft with modified Shape-Box with height 0.5mm

[brettvitaz]

Version

Version 2.3.0-rc2+

Operating system type + version

MacOS Big Sur (11.1)

3D printer brand / version + firmware version (if known)

Ender 3 / Prusa MK3S+

Behavior

Program crashes when using a raft with the Shape-Box

Steps needed to reproduce the problem

• Add shape "Shape-Box"
• Resize to 25x25x0.5
• Add 1 layer raft
• Slice

Expected Results

• Sliced stubby box with raft

Actual Results

• Program crashes

Project File (.3MF) where problem occurs

Shape-Box with Raft.3mf.zip

[lukasmatena]

Reproduced, thanks.

For reference: In version 2.2.0, slicing is stopped by the 'Empty layers detected' error, so there is some problem there as well, it probably just stops before the crash. The error was turned into a warning in 2.3.0.

[lukasmatena]

The problem is that raft is only generated when ((m_config.support_material || m_config.raft_layers > 0) && m_layers.size() > 1) (PrintObject.cpp:420). In this case there is just one object layer, so the last condition is false and the raft layer(s) is then missing. This scenario (one-layer object + raft) apparently never worked (I tried in 2.0.0, 2.1.0 and 2.2.0). It just did not crash.

Given how close the 2.3.0 final is, we will probably just hotfix the crash itself (so we get the behaviour from previous versions) and leave the problem itself to be solved later. I'm not sure why the condition wants two or more object layers, there may be a reason. The hotfix is currently in branch lm_230_rc2_fixes (b1a98bd) to be reviewed.

[lukasmatena]

The crash should be fixed in master by 837070a for 2.3.0 final release. The raft is still not generated (same as in previous versions) but it does not crash now. I'll leave the issue open for now.

[bubnikv]

Fixed with 43c05d3