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Is kapton tape necesary?

Posted by Pixbae 
Is kapton tape necesary?
December 15, 2012 10:09AM
Hi everyone!

I'm finishing my first build of a 3d printer, a reprap prusa mendel v2. I'm at the hot end part, this guide tells me to get kapton tape to secure some cables:

[docs.google.com]

but I can't find any, nobody seems to know what a kapton tape is here in m country. Could I replace it with this regular black electric tape?:



Also, can I crimp the ferrules with a needle nose plier? can't find any crimper small enough for the ferrules that were given to me.
Re: Is kapton tape necesary?
December 15, 2012 10:14AM
I crimp things with pliers that's fine.

There are ways of building a hotend without kapton tape, if you are happy to have non insulated wires dangling about. There are other high temperature insulation materials, but kapton tape is easy to use since its just like sellotape that works at very high temperatures. However: DO NOT USE NORMAL ELECTRICAL TAPE ON THE HOTEND OR ON ANY WIRES NEAR THE HOTEND

It will melt and release lots of horrible chlorine based gasses!


The only place I have found to buy kapton tape is ebay, there is plenty on there!
Re: Is kapton tape necesary?
December 15, 2012 12:31PM
Kapton is a brand name. You might want to look for polyimide tape. you can get it cheap from deal extreme, but postage can take a while.

Edited 1 time(s). Last edit at 12/16/2012 03:46AM by Greg Frost.
Re: Is kapton tape necesary?
December 15, 2012 01:51PM
Thanks everyone. Yeah i will order the tape anyways but its frustrating having to wait 2.5 more weeks. I bought aluminum foil tape, its supposedly for high temperatures. Maybe this will work?



Edited 1 time(s). Last edit at 12/15/2012 02:08PM by Pixbae.
Re: Is kapton tape necesary?
December 15, 2012 03:02PM
Aluminum has high thermal and electrical conductivity so maybe it's not a good idea at all right? :p ideas anyone?
Re: Is kapton tape necesary?
December 15, 2012 04:51PM
I just used RTV red silicone, capable of about 360 degrees C. But before I stuck the resistor and thermistor in the head I dabbed them in a little thermal paste for better heat conduction. Then used the silicone on the outside to glue the parts into the head. It also holds the PTFE wire insulation in place.

I have only been printing on cleaned glass so I didn't want to buy kapton tape, this is why I did it that way.
Re: Is kapton tape necesary?
December 15, 2012 05:27PM
Thank you very much, I've just come to understand that kapton is just to hold the thermistor and resistor in place, I was wondering what else could do the job and couldn't think of anything that wasn't simple and effective. But I searched for that silicon in the local hardware website and it seems they have it so ]I'll see if I buy it tomorrow.
Re: Is kapton tape necesary?
December 17, 2012 03:58AM
" I've just come to understand that kapton is just to hold the thermistor and resistor in place,"

I think most people also cover the glass with Kapton tape in order to get the print to stick to the glass. I've tried printing on glass without the tape and the part comes off.

Edited 1 time(s). Last edit at 12/17/2012 04:01AM by TerryKidd.
Re: Is kapton tape necesary?
December 17, 2012 10:28AM
@TerryKidd - Just curious, Do you use PLA or ABS? I've heard it is possible to print with PLA on bare glass, if the glass is on a heated bed and absolutely clean of oils and dust. I personally have not yet had an opportunity to try it, though.
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