Hi,

This happen sometime when there is something corrupted or defect in the model.

In your case, you can't stretch it anymore so i presume the model is broken.

In such case, you should usually have the model splited in sub component.

So you can start from the model and deduct the sub element till the volume is completed. At each operation, you can check if your volume can be stretched. If at a moment, you can't it mean that the last sib component has push the issue. Than you can try to redo the sub component.

I have reload the volume that i did in one minute.

Looks ok to me.

But when i review your model, i see some strange line.

This can also happen from model imported.

Bye