by pcpoirier, published
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If you've ever had molten plastic back up far enough in the hot end that it starts to fill the PEEK tube (black plastic heat break) and then, for whatever reason, had to remove and disassemble your hot end then you'd know :-).
Basically it's a drill guide you stick into the PEEK tube so you can drill out the plastic blockage without damaging the PEEK tube.
...I'm pretty sure.
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Usually the hot end side is all that is needed to be drilled.
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