Crysta-Line Transparent ABS

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JuliaDee
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Crysta-Line Transparent ABS

Post by JuliaDee » Fri Sep 20, 2013 1:44 am

Nice stuff, now I'm less envious of PLA-enabled people. Save me some noodles, Roller!

http://www.3dprintergear.com.au/Crysta_ ... 175abs.htm

Printed at 220C, 0.35mm layer height.
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Last edited by JuliaDee on Fri Sep 20, 2013 4:04 pm, edited 1 time in total.

DickL
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Re: Crysta-Line Transparent ABS

Post by DickL » Fri Sep 20, 2013 3:59 pm

Hi
How do you control your print head temp? It seems you have more steps than the ones I see online.

Tnx
DickL

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JuliaDee
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Re: Crysta-Line Transparent ABS

Post by JuliaDee » Fri Sep 20, 2013 4:08 pm

DickL wrote:How do you control your print head temp? It seems you have more steps than the ones I see online.
Hi DickL,

See this:

http://www.pp3dp.com/forum/viewtopic.php?f=28&t=22170

It's a rotary switch that taps into a string of series-connected 3.6 - 3.7 Ohm resistors. 0 Ohms for max temp, 26 Ohms for 190C, 10C steps in between.

Julia

DickL
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Re: Crysta-Line Transparent ABS

Post by DickL » Fri Sep 20, 2013 11:45 pm

Hi
Nice job. I had no idea what the resistor values would be. Could you have used a make before break switch?

Tnx
DickL

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JuliaDee
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Re: Crysta-Line Transparent ABS

Post by JuliaDee » Sat Sep 21, 2013 3:34 am

Make-before-breaks are not as common and tend to be much larger than other options. Using a tapped string rather than selecting among various individual resistors ensures that the thermocouple circuit never goes open regardless of the switch characteristics. Switching "on the fly" is still risky, however, because the software doesn't like to see abrupt changes in its temp reading. Pausing the print for temp changes and then resuming seems safe.

This thread refines the whole thing, building on initial reported tem vs thermocouple resistance measured in early 2012, and contains Roller's handy spreadsheet resistance calculator:

http://www.pp3dp.com/forum/viewtopic.ph ... ula#p25432

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