Remove silicon heater from glass bed

[Dushyant Ahuja]

Hi,

I recently broke my glass bed while trying to trim it down a little. Unfortunately, this was after installing a keenovo silicon heater on it. What would be the best way to remove a silicon heater from glass. Now that the glass is broken, I would like to remove and re-use the heater.

Also, on the off chance, can anyone advise the best place to buy a 400mm x 400mm mirror in London.

Thanks

Dushyan tAhuja

[Rich Webb]

#Disclaimer: I've never tried these techniques but what the heck.

#Warning: Wear appropriate personal protective equipment, such as gloves and eye protection.

1) Try freezing it. Differential expansion combined with the (presumed) reduced flexibility of the silicone at freezer temperatures may allow you to separate them.

Note that it's possible that the differential expansion would be sufficient to cause the glass to shatter. I don't think that will happen but, to be extra cautious, put the assembly inside a bag of some sort before tossing it all into the freezer.

2) Try silicone oil. Something like this. Allow it to wick between the pad and the glass and you may be able to slide the glass pieces free.

3) Soapy water might work in a similar fashion.

[Lee]

Sticky stuff remover? https://www.amazon.co.uk/Mykal-Sticky-Stuff-Remover-250ml/dp/B000TAT4GM

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[Wes Cherry]

I’d be super careful with silicone around a bed.   A tiny bit transferred to your new bed can cause prints to not stick.   Silicone is incredibly difficult to remove. Most solvents just spread it around -  I believe strong caustics are one of the only things that removes it.    

D-limonene is good for removing adhesive if you end up with residual goo on your heater.  Soak a paper towel in it and cover with Saran Wrap or alu foil.  Wait 30 minutes and the adhesive should come off easily.

D-Limonene 100% FOOD GRADE Citrus Solvent 4oz Dlimonene Orange Oil https://www.amazon.com/dp/B01FL9QGWA/ref=cm_sw_r_cp_api_i_kNlrCbWN013PS

-'//es

[Steven Butterfield]

When you put the silicone heater back on your printer; stick the heater to the underside of an aluminum plate then use a few squares of 0.5mm Gino pad to stick the glass to the top of the aluminum. The aluminum will help spread the heat evenly and the Gino pad will allow the aluminum and the glass to expand at different rates without breaking the glass. The other benefit is you can easily remove the glass and replace it between prints or it gets damaged. This method will work a lot better than bonding a silicone heater directly to the glass.

[the_digital_dentist]

The reason to put the heater on aluminum is to create even heating.  If you put glass on top of the aluminum, any deviation from flatness in the aluminum or glass will leave an air space between the glass and aluminum.  Air and glass are both good thermal insulators.  You will get uneven heating as a result.  If you deliberately put spacers under the glass to introduce air space between the glass and aluminum, you will also get very uneven heating.

If the glass is put on the bed plate with clips, the bed can expand under the glass and there won't be any danger of the glass breaking due to a difference in thermal expansion, though you may crash the extruder nozzle into the clips.  If you glue the glass to the aluminum you might create a problem.  

I have found that paint stripper dissolves the 468MP adhesive used on Keenovo heaters in a few minutes.  Not sure, but it probably won't have any effect on the silicone.  I'd test a little of it before slathering it on.