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UM2 heater block screw stuck

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When changing the heater block and nozzle in my Ultimaker 2, the screw holding the heater element and temp sensor is stuck fast.

I've tried heating the block to 150 degrees and using a torx screwdriver, but I've only succeeded in stripping the inside portion of the screw. Pliers don't seem to get enough grip. I've got a new screw and heater block/nozzle, so damaging the screw isn't a concern.

There was some PLA seepage around the block when disassembling it, so I imagine that some PLA has seeped in the threads. I don't have chloroform to dissolve PLA (nasty stuff and hard to come by anyway).

Anyone have any idea what I can try to get this screw loose?

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Wow. How about vice grips? You should have used metric hex wrench - it's .5mm smaller than all the other screws - I think 1.5mm instead of 2mm for the other screws.

Anyway I would try vice grips with the nozzle at 150C.

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I've tried hex tips and torx tips (torx gives a better grip inside the screw), as well as vice grips and heating the block at various temps. Found some acetone to dissolve any PLA remains, but didn't seem to help

I'm guessing I'll end up having to replace the heater and temp sensor as well, but that just isn't right. Poor engineering.

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