For a standard Simpson it is potentially bad. It could possibly destroy the hot end and a few plastic pieces. However, if you turned gravity around the failure would be no big deal. For a 1 arm SCARA design that Quentin Harley and I are contemplating, the failure would also be no big deal. When I get this going I will try to get an estimate for the cycles to failure. I can then give a recommendation as to how often you need to change out strings.
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