Thanks for the advice everyone, I had four boxes of mugs and have been using some from each box and so far all the ones that have cracked came out of the same box. Yes that's right Janners they cracked with hot water even if I hadn't pressed them first so it must have just been a faulty batch.

<r>Thanks Bms. The latest four I tested hadn't been through the mug press but two still pinged with hot water so I'm thinking I might have a faulty batch. I have another 3 boxes of 36 so I'll test some from each box, with and without pressing. <br/>
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I have reduced the temperature as you ...

<r>Thanks very much for the replies. Bms, when you say I should put the mug in at idle temperature, does that mean I have to let the press cool back down to idle temp between each mug? I was hoping to put them in one after another without waiting in between.<br/>
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I have since tested another ...

<t>Hello, I'm new to the forum but have been reading it a lot and have just bought the DF1 press from BMS and a Ricoh 3110 printer (and BMS mugs). I made my first mug yesterday and it looked great, so I went to make a cup of tea in it and as I poured the boiling water in it pinged quite loudly and a ...