I think any angles in drill/mould holes are a bad idea as stress always focusses there. The triangle-hole head I made cracked at the corners. Round holes are much better. I can see those hex holes cracking pretty quickly.
@JOL started
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I think any angles in drill/mould holes are a bad idea as stress always focusses there. The triangle-hole head I made cracked at the corners. Round holes are much better. I can see those hex holes cracking pretty quickly.