The build height check in Print::validate() compared object layers that already include the Z shrinkage compensation against printable_height divided by that compensation. That counted the compensation twice, so objects that fit were rejected. The check also left out the raft, so an object whose top plus the raft is above printable_height passed validation.
The check now adds object_print_z_min to the top layer and applies the compensation once. The shrinkage message is shown only when the object fits without the compensation. Belt printers apply the compensation to the raw model height, since their height does not come from the layers.
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