Set Square V2

Following some design realisation a few days ago, it came to me that I must update the set square. Essentially nothing wrong with the previous one except that it was a little delicate. So I have made it about twice as strong. Ok..... what happened ? I designed and printed it as a surprise for my brother who is a very accomplished builder here in England. On the day he was finally coming to see me and I would suprise him with it, I realised two things. the first I couldn't fix, the second... well As you probably know it has gone colder now so I put the heating. Little did I realise the set square was near the heater. It warped in both directions. But not the square. So I kept it to show my brother later that day... as mu brother was arriving, I knocked it off the side. My dog ran to see my brother and stood on it, breaking in two. We laughed. Here's version 2, a bit stronger, but not heat proof.