Depends on the plastic. Accrylic which is what the fist plastic blocks used cracked easly. This is the smae plastic as cd cases and stuff... Im not sure WHY any one decided to use it as theres better plastics. Polyethylene is good if you can get it - I got a big peice from a cutting board. It works well but I too prefer metal tops because they look better and can be soldered on.
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