Hoffman SL-9 weakness

I’ve had good experience with Hoffman AR lowers and wanted to try his latest AR-9 lower. Was in the middle of assembly and I accidentally dry fired it which caused the hammer to slam into the lower and cracked it, it was printer in Polymaker PLA pro. Looking at the model it seems the area forward of the trigger and hammer assembly is extremely thin.

During normal operation has anyone had a problem with this thinned out area cracking? I don’t want to print it again if this is a known weakness in this design.

I was looking at his older version and noticed that area isn’t as thinned out because it doesn’t have last round bolt hold open and I’m wondering if that may in fact be a stronger print and I’ll just have to deal with no last round bolt hold open.