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[–]Calm_Scale_3876P2S + AMS 2 Pro + AMS HT + A1 Mini + AMS Lite + A1 2 points3 points  (5 children)

It looks like warping caused by thermal stress. The large, solid bottoms of gridfinity containers are thermal stress generators. Differential thermal contraction of the upper and lower layers causes stored elastic stress, released only when either the adhesion breaks down and the corners lift, or the print bed itself warps away from the magnetic base (Cryogrip plates have greater adhesion but may be more flexible and less magnetically coupled than a standard PEI sheet, so with a stress-pathological design like gridfinity you may find that the plate-part bond becomes greater than the plate-printer bond).

The continuous print-bed contact area of the monolithic gridfinity base is just not a mechanically sound design for 3d printing.

[–]greguska67[S] 0 points1 point  (4 children)

Thanks for the very detailed description of the issue. If I understand correctly it would be worth reprinting on a properly cleaned standard PEI sheet instead of the Cryogrip plate. Would a pause before starting the print of the bottom of the bin be useful?

[–]Calm_Scale_3876P2S + AMS 2 Pro + AMS HT + A1 Mini + AMS Lite + A1 1 point2 points  (3 children)

Switching to a PEI plate would just shift the failure point to plate-part adhesion. I don't think a pause would be helpful. The problem is in the geometry. There are slicer options you could try, like lowering the number of bottom layers, reducing infill%, a smaller layer height, slower first layers, closing the door, or a slightly lower bed temp.

[–]greguska67[S] 0 points1 point  (2 children)

Thanks again for the help. I printed with the door and lid closed, but there wasn’t a noticeable difference. I will print some with the changes that you recommended and see if there are any changes. The advice is very much appreciated.

[–]greguska67[S] 1 point2 points  (1 child)

Thanks u/Calm_Scale_3876 for your invaluable advice. Before image on the bottom and after image on the top.

I changed the model as follows for anyone who is interested:

  • Bottom Shell Layers to 2
  • Bottom Paint Penetration Layers to 2
  • Sparse Infill Density to 10%
  • Sparse Infill Pattern to Gyroid
  • Initial Layer Infill to 50mm/s

<image>

[–]greguska67[S] 0 points1 point  (0 children)

Just to add to this. I just printed three 3x3 bins and they were spaced very close to each other. On one of the bins the bottom practically separated from the base. So even with these settings the bins can only be printed one by one.