Hi folks maybe you can give me some advice,

3D Printing
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1

Hi folks maybe you can give me some advice, I try to find infos online, but was not successful.

I ordered for our school from MachinableWax some nice wax filament, for casting bigger in bronze and silver (using 3D printed wax designs) …
The company advise to print at 135-140c. Celsius. After getting our “Printrbot Metal Plus” ready, I found out that Cura is telling me “cold extrusion prevented” !

QUESTION:

  • Is there a easy option to “disable” cold extrusion prevention ?
  • What else can I do to get the Printrbot printing in low temperature ?
  • If not what other (cheaper) printer could I buy, to print low temperature ?

I also wroth the team from Printrbot, asking them the same question, the answer which came back was as followed =
I apologize for the late reply, unfortunately there is not an easy way to stop the cold extrusion for low temp filament. The lowest temp that will not cause a “cold extrusion” would be 170C

Thanks for help
Best
Frank

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2

I believe you can use an M302 GCode to enable cold extrudes.

3

You can also lower the minimum extrusion temperature.

4

Thx for both of your answers, I will try …

5

I imagine a fan would be a good idea. Just a guess.

6

Hi @NathanielStenzel ​ to problem is not the cooling itself, but the Printerbot “board” is not allowing to go below 170c. to prevent from cold extrusion. This what Cura software is telling me, if I like to print.

7

@Frank_Zottel I think the other two mentioned how to take care of that part of your problem. After that, I would recommend a fan.

8

Yes that’s correct thank you.

9

If you can’t change the software behavior, but can hack the hardware, you could put a resister in parallel with the extruders thermister, a value chosen so that when it was at 135, the control board was seeing resistances that suggested it was actually at 170. [If I remember correctly, a thermisters resistance goes down with increasing temperature, hence a resister in parallel].