1 Topic by RavensCrest

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Topic: thermocouple is facing fan, good or bad?

Hey elmoret,
i was rotating my pipe nipple because of the motor made the opening rotate to the side, so i made it face top again.. and now the thermocouple is right above cooling fan... (the opening hole is covered with kapton tape)
does it matter? since copper spreads heat very fast, maybe the top and bottom temp difference is not that much to begin with.
any suggestions?

Raven

Solidoodle2 with Ceramic tile heated bed http://www.soliforum.com/topic/2544/my- … eated-bed/
"1kg should last for an while" is a lie!

2 Reply by elmoret

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Re: thermocouple is facing fan, good or bad?

That's fine, as long as its covered with Kapton.

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

3 Reply by RavensCrest

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Re: thermocouple is facing fan, good or bad?

thx~!

Solidoodle2 with Ceramic tile heated bed http://www.soliforum.com/topic/2544/my- … eated-bed/
"1kg should last for an while" is a lie!

4 Reply by RavensCrest (edited by RavensCrest 2013-08-31 07:29:45)

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Re: thermocouple is facing fan, good or bad?

Reporting back... with thermocouple directly above cooling fan covered by kapton tape, i am getting 1.5mm at 180 and 1.6mm at 170.. so i decided to go below recommended temp.. 
I have to lower my temp to 165 in order to print 1.75mm (actual size is about 1.74 so maybe i should go couple degree lower)

*never mind...  165 is too low... back to drawing board.

Solidoodle2 with Ceramic tile heated bed http://www.soliforum.com/topic/2544/my- … eated-bed/
"1kg should last for an while" is a lie!

5 Reply by elmoret

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Re: thermocouple is facing fan, good or bad?

The hole is intentionally undersized slightly in order to prevent jams in sensitive hotends. Some flavors of ABS exhibit more die swell than others.

You can increase the hole size slightly if you need to. It is drilled with a 1/16" drill by default.

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

6 Reply by RavensCrest (edited by RavensCrest 2013-08-31 18:48:47)

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Re: thermocouple is facing fan, good or bad?

yea.. i might need to do that... playing with temperature is hard.. when temp is too low.. motor will grind and break that little washer :-(
so far i get better result by having a "tent" covering the lower part of the nozzle, so this way air don't blow directly on the thermalcouple.. not happy with this method.. but it prevents direct blow of air..

update: with tent setup, i can get it up to 173c, now i am considering "normal"

Solidoodle2 with Ceramic tile heated bed http://www.soliforum.com/topic/2544/my- … eated-bed/
"1kg should last for an while" is a lie!