Fimo on hot ends


What you can see here is a nice try.

Before backing it used to be a well shaped FIMO cube. FIMO is some kind of clay which can be backed at 110 °C. In a few blogs you can read something like "FIMO accidentally backed at 200 °C - no problem". This is not true. At around 180 °C the FIMO gets bubbles and deforms. At 200 °C it starts to smoke - smells very unhealthy!

After opening every window I can find, I tested its consistency: No good!

So to everyone trying to use FIMO as isolation of your hot end: Keep your fingers off!

Greetings to everyone


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  • I use fire cement - stuff used to fill gaps around flues and chimneys. It's pretty cheap, and kind-of mouldable. That can be baked at well over the 250 C needed for a hot end, and it's pretty cheap. The normal problem is that you have to buy a huge tub (5-10 pounds uk) and only use a tiny bit :-)<br />It goes pretty hard after firing and is also non-conductive, so it's ok to use for nichrome heaters, etc.

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