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3d - Printworx

Anet A8 extruder heater

Started by Wyntrblue, Tuesday,July 03, 2018, 12:00:22

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Hi guys,

I’m finding that my heating element is slowly sliding out of the hot end when printing. I have tightened the grub screw as much as I can but it’s still working itself loose. Any tips on keeping the element in the extruder?


Bad Raven

Might need more info and even better photos to provide positive help, but what does the screw tighten in, is it metal to metal?  In which case threadlock is the obvious first try?
HobbyKing Fabrikator II Mini, 100x100x100. (a re-badged Malyan) - Modded with magnetic Flex Bed.
Original Prusa i3 Mk3 (All Black).
Anycubic Photon S  (Resin/UV).


Quote from: Bad Raven on Tuesday,July 03, 2018, 13:06:18
Might need more info and even better photos to provide positive help, but what does the screw tighten in, is it metal to metal?  In which case threadlock is the obvious first try?

Ok the round bit is the heating element. There’s a grub screw that screws in from the bottom that supposed to hold the element in place. Iv got the screw as tight as I can but the element slowly slides out the back taking the temp sensor with it which if left unchecked will lead to a thermal runaway and probably a fire. I keep poking the element and sensor back in and I can feel the grub screw on the element but still it comes out....

I’m tempted to find some high temp glue and glue it all in...


This is what it looks like if it’s left unchecked for a while...


Difficult to be certain without seeing the rear of the heater block.  If the heater cartridge slides out (as already mentioned) try thread locking the grub screw, or taping the cartridge in place by wrapping aluminium tape around the heater block.  Glue will do it too, but you'll never easily get it all apart again and it seems a bit of a faff for future servicing and repair reasons.

Why does the thermistor come out when the heater cartridge moves?  Isn't the thermistor held in by a separate fixing?

Personally I'd keep it simple and spend a couple of quid on a new heater block *just make sure it's suitable for your printer/setup).  If the same thing continues to happen after installing a new heater block you'll know you've got another issue on your hands.


Pic of the rear of the heater block.

And I have some ali tape so when it’s finished it’s current print and cooled down I will try adding a few small strips to the element to help hold
It in place


Im shocked...... a anet a8 with another potentially disastrous issue, seems unbelievable! :rolleyes:

get a roll of 10mm Kapton take and simply tape it to the heater block, the kapton tape wont melt.
Geeetech Prusa i3 pro-B (ABS Workhorse)
Pultur Prusa (my own design)
Poltur XL (my own "MUST BE BIGGER" design)
Poltur XL v.2 (my own "MUST BE BIGGER STILL, MUST USE EXTRUSION" design)


to be fair to the printer, for the money iv had very few issues with it and according to its statistics its now printed for 32days and 3hours since i put it together at christmas.

other than soldering on the connector on the heat bed and printing a belt tensioner this is the first thing thats happened thats given me pause for thought.

still ali tape seems to have resolved it, along with replacing the grub screw with a proper screw.

thanks all