Why are the blocks not "rock solid"? Did my machine malfunction?Updated 9 days ago

No, this is an intentional design feature, not a malfunction. The SPC provides only the minimum heat necessary to make the plastic stick together. It is not meant to create rock-hard bricks. It is normal for blocks to come out unevenly or fall apart; this does not affect the recycling process as long as they fit in the provided envelopes. Ensure your plastic is clean and free of contaminants like paper.