Notifications
Clear all

MK3 heatbed question - chip on trace  

  RSS
Alexander
(@alexander-4)
New Member
MK3 heatbed question - chip on trace

Hey there guys and gals,

So I have been printing with my MK3 for about two years now with few issues at all.  Recently I noticed what looks to be a chip in one of the PCB traces on the heated bed.  It seems to be across about 1/3 to 1/2 of the width of that trace and I am concerned about this resulting in a potential increase in resistance or causing some other severe thermal issue over time.  I have yet to notice any change in function so far.

Should I be concerned about this issue and is there anything I can do to remedy it?

 

Alex

 

Posted : 28/11/2020 8:58 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: MK3 heatbed question - chip on trace
Posted by: @alexander-4

Hey there guys and gals,

So I have been printing with my MK3 for about two years now with few issues at all.  Recently I noticed what looks to be a chip in one of the PCB traces on the heated bed.  It seems to be across about 1/3 to 1/2 of the width of that trace and I am concerned about this resulting in a potential increase in resistance or causing some other severe thermal issue over time.  I have yet to notice any change in function so far.

Should I be concerned about this issue and is there anything I can do to remedy it?

 

Alex

 

 

There is not much you will be able to do. I would seal the cut with heat resistant silicone or something similar

You could check the internal resistance of the heating bed. It should be 3,5 ohms.

MK3-Mini-Widerstaende-Heizungen

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 28/11/2020 10:13 pm
Agkirk
(@agkirk)
Trusted Member
RE: MK3 heatbed question - chip on trace

Is it a divot/missing material?   Looks a bit like debris on the surface and coated with a top coat.  If the latter then likely not a problem.  If the former then only time will tell, just gets a bit hotter in the area.

Posted : 28/11/2020 11:11 pm
Neophyl
(@neophyl)
Famed Member
RE: MK3 heatbed question - chip on trace

The coating acts an an insulator.  You ideally should restore that property but you need to do it with something that wont cause a bump in that area (or it will make that bit of your print surface bulge upwards).  I've found that using a thin nail varnish will do the trick.

I would monitor that area over time though to make sure there are no signs of excessive heat in that spot. 

Posted : 28/11/2020 11:31 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: MK3 heatbed question - chip on trace

@agkirk

for example - this silicone has good insulating properties, is heat resistant, can be processed well and has excellent adhesion:

https://www.k2-global.com/de/products/k2-black-silicone-350c-85-g

I have used it several times on the 3D printer, for example to glue the printing plates magnets.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 28/11/2020 11:56 pm
cwbullet
(@cwbullet)
Illustrious Member
RE: MK3 heatbed question - chip on trace

I am not sure how deep that is.  It is easily palpable, consider filling it with the product Karl suggested.  If not, I have plenty of scratched on one of my beds and it functions well.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 29/11/2020 1:16 am
Chocki
(@chocki)
Prominent Member
RE: MK3 heatbed question - chip on trace

Use nail lacquer, you can get matt black and build it up in layers if needed. Or a thin UV setting adhesive, I suppose UV nail lacquer could work as well.

The advantage of the UV lacquer is that you can put a drop on, drag a credit card over to remove the excess, wipe away any spread still wet lacquer, then when you are happy, give it a 10 second blast with a UV torch and instant set.

Just found this: https://www.nailpolishdirect.co.uk/led-uv-halo-gel-polish-collection-navy-8ml-n2760-p25964

This post was modified 11 months ago by Chocki
Normal people believe that if it ain’t broke, don’t fix it. Engineers believe that if it ain’t broke, it doesn’t have enough features yet....
Posted : 01/12/2020 10:02 pm
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: MK3 heatbed question - chip on trace

If you have a micro applicator A tiny drop of cyanoacrylate will insulate, and if you happen to have some silver epoxy around you could very easily rebuild that trace and insulate with cyanoacrylate. without creating a bump. but if you don't already have it it's probably not worth it.

NM

The Filament Whisperer...
Posted : 03/12/2020 6:01 am
cwbullet
(@cwbullet)
Illustrious Member
RE: MK3 heatbed question - chip on trace

True.  MOst epoxy and CA glue will take 110-120 C

--------------------
Chuck H
3D Printer Review Blog...
Posted : 03/12/2020 10:49 am
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: MK3 heatbed question - chip on trace

The epoxy I use has a service temperature range of -55 to 150C and is of course more conductive then copper, and the CA's range is -55 to 250C and completely non-conductive. it also halts oxidization.

The Filament Whisperer...
Posted : 03/12/2020 4:07 pm
cwbullet
(@cwbullet)
Illustrious Member
RE: MK3 heatbed question - chip on trace

@swiss_cheese

I would use JB weld.  It will take much higher temps than most epoxies.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 03/12/2020 4:12 pm
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: MK3 heatbed question - chip on trace

@cwbullet

is it conductive?

The Filament Whisperer...
Posted : 03/12/2020 4:44 pm
cwbullet
(@cwbullet)
Illustrious Member
RE: MK3 heatbed question - chip on trace

@swiss_cheese

JB Weld is not a conductor.  It is an insulation.  I use in in Rockets to insulate against heat and electricity.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 03/12/2020 5:00 pm
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: MK3 heatbed question - chip on trace

@cwbullet

I see, just to be clear I was suggesting the use of a Silver epoxy specifically, it's (highly electrically conductive) to rebuild the trace and eliminate any resistance potentially caused by a nick or brake in the trace, and the use of cyanoacrylate to insulate it electrically, and stop oxidization of the circuit.

Anyway, Its just a suggestion.

The Filament Whisperer...
Posted : 03/12/2020 5:23 pm
cwbullet
(@cwbullet)
Illustrious Member
RE: MK3 heatbed question - chip on trace

@swiss_cheese

Understood, I actually used a little JB weld on my printer on a small gouge with clear tape (to shape it flat).  I pealed off the tape.  It worked and does not effect the heat transmission that I can’t tell.   I would not use it for a larger lesion.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 03/12/2020 5:47 pm
Share: