I believe that this was caused by thermal stress. More precisely, inhomogeneous stress.

[whackyhack (Yuan Liu)]

I believe that this was caused by thermal stress. More precisely, inhomogeneous stress. What causes thermal stress to be inhomogeneous? Is it directly related to infill? In other words, if infill is 100%, would the structure be more resistant? When you print a utility object, do you use more infill?

During build, Ares clipped the outer wall of the vertical beam by 2mm due to its reduced print area (Sign in - Google Accounts). But this does not cause the most deformation; I guess that’s because of the enclosed structure. The free beam suffered the most deformation. I suspect that it is partially because the center was screwed to the vertical beam?

Originally shared by Yuan LIU

After a scorching day in the trunk, the laser holder tilted by more than 10º. I am not sure if this is still fit for 3D scanning. How much can software compensate for imprecision?

I didn’t take structural picture before this, but the second picture taken right after assembly shows straight lines. Over time, I noticed some curve, but I am certain that it wasn’t like this in the morning.

[Ryan_Carlyle]

Looks like the car trunk was hotter than the glass point of the plastic, and it simply sagged under its own weight. Very common with PLA.

[whackyhack (Yuan Liu)]

+Peter van der Walt @Ryan_Carlyle Good point about weight. So if I put it back into the trunk in an invert orientation, I can hope to get some correction.

[John-Paul_Hopman]

@whackyhack Might just be better off using a heat gun to soften the PLA again and manually bend it back. Putting it back in the trunk could lead to more problems.

[Jeff_DeMaagd]

This sort of thing is why I worked hard to learn how to make a good ABS part. PETG might be easier for some people. PETG often gives you at least 15˚ more head room before problems crop up.

[whackyhack (Yuan Liu)]

@John-Paul_Hopman Thanks for the pointer. Will do.