My rotary blade had been in use for a while, but it was still cutting fine, when this happened. I've never had one just snap in two like this! I was probably pressing harder than normal, since I was trimming off the excess batting and backing after the quilting was finished, but still...this surprised me. I realized immediately that something was wrong, replaced the blade, cutter is functioning perfectly now (with new Harbor Freight blade). And no, this particular blade, the one that broke, was not from HF. It's an Olfa blade I think.