The title was a bit hopeful on my part but it is something we need to get hammered out for good. I've switched over to the 100k thermistor and finally got the appropriate capacitor value for C3: 1.5 nF. I also found in the forums that I needed a 4k7 resistor in series with C3. I assume this is R3. Is that right. I've switched out C3 and R3 to the values stated but still don't have this thing functional. The relevant preference settings are as follows: Extruder0_Beta: 3960 Extruder0_Rz: 337254 Extruder0_Capacitor: 0.0000000015 Extruder0_ExtrusionTemp: 240 I played around with these values some to see if they were the culprit but with no luck. I tried reducing hm and hb to lower values as per the page here: [reprap.org] Got the temperature up from 73 to 107 C. Still stuck at that point though. My question is, What is the general problem I am encountering with this system? Why can I not go up above a given temperature? Is it a hardcoded value? Demented https://reprap.org/forum/read.php?13,10702,10702#msg-10702 Wed, 22 Jul 2026 01:29:26 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?13,10702,10803#msg-10803 https://reprap.org/forum/read.php?13,10702,10803#msg-10803
Demented]]> Demented Chihuahua Controllers Sat, 05 Apr 2008 13:43:30 -0400 https://reprap.org/forum/read.php?13,10702,10802#msg-10802 https://reprap.org/forum/read.php?13,10702,10802#msg-10802 nophead Controllers Sat, 05 Apr 2008 12:36:12 -0400 https://reprap.org/forum/read.php?13,10702,10801#msg-10801 https://reprap.org/forum/read.php?13,10702,10801#msg-10801
When the molten HDPE cools it shrinks upwards leaving an air gap around the edges.
When you heat it again it sags blocking the nozzle and trapping the air above it. The air expands and blows the HDPE out of the nozzle, sometimes with an explosive crack.]]> nophead Controllers Sat, 05 Apr 2008 12:30:33 -0400 https://reprap.org/forum/read.php?13,10702,10800#msg-10800 https://reprap.org/forum/read.php?13,10702,10800#msg-10800
No, I haven't run the heater profiler again since I installed the new cap and resistor. I'm doing that right now as I type this. I'm sure my values are going to be pretty different.

Demented]]> Demented Chihuahua Controllers Sat, 05 Apr 2008 12:20:09 -0400 https://reprap.org/forum/read.php?13,10702,10795#msg-10795 https://reprap.org/forum/read.php?13,10702,10795#msg-10795
Have you run the heater profiler as described here: [reprap.org]]]> nophead Controllers Sat, 05 Apr 2008 03:17:12 -0400 https://reprap.org/forum/read.php?13,10702,10790#msg-10790 https://reprap.org/forum/read.php?13,10702,10790#msg-10790
On the down-side, its 30 C off! I turned on the extruder motor and have been letting it poop hot plastic for about 5 minutes now just because it's been so long since it was used at all.

I'm leary about turning it up higher! I don't want it to get out of control]]> Demented Chihuahua Controllers Fri, 04 Apr 2008 22:31:35 -0400 https://reprap.org/forum/read.php?13,10702,10777#msg-10777 https://reprap.org/forum/read.php?13,10702,10777#msg-10777 nophead Controllers Fri, 04 Apr 2008 01:53:12 -0400 https://reprap.org/forum/read.php?13,10702,10776#msg-10776 https://reprap.org/forum/read.php?13,10702,10776#msg-10776
I'm looking into getting a "real" measurement device for a test run. I can sort of tell if the room temperature settings are normal but past that I don't have that sort of measurment capacity.

@ nophead

So I need a larger value, not a smaller one? Can someone check my values at the page I gave above with the given rz and beta values? I'm pretty sure that the calculator said around 2 nF. I can be stupid sometimes, however. ;-) I'll nix the series resistor then. Back to the standard value...

I struggle On.

Demented]]> Demented Chihuahua Controllers Thu, 03 Apr 2008 23:19:08 -0400 https://reprap.org/forum/read.php?13,10702,10714#msg-10714 https://reprap.org/forum/read.php?13,10702,10714#msg-10714 degroof Controllers Mon, 31 Mar 2008 11:05:27 -0400 https://reprap.org/forum/read.php?13,10702,10712#msg-10712 https://reprap.org/forum/read.php?13,10702,10712#msg-10712 That capacitor value looks way too low. See Steve's post here [sdreprap.blogspot.com] he is using 0.22uF.

I don't think the series resistor is necessary for the 100K thermistor. It will add large errors.]]> nophead Controllers Mon, 31 Mar 2008 04:19:51 -0400 https://reprap.org/forum/read.php?13,10702,10706#msg-10706 https://reprap.org/forum/read.php?13,10702,10706#msg-10706
Demented]]> Demented Chihuahua Controllers Sun, 30 Mar 2008 22:43:54 -0400 https://reprap.org/forum/read.php?13,10702,10705#msg-10705 https://reprap.org/forum/read.php?13,10702,10705#msg-10705 redskinsjbs Controllers Sun, 30 Mar 2008 22:21:13 -0400 https://reprap.org/forum/read.php?13,10702,10702#msg-10702 https://reprap.org/forum/read.php?13,10702,10702#msg-10702
I've switched over to the 100k thermistor and finally got the appropriate capacitor value for C3: 1.5 nF. I also found in the forums that I needed a 4k7 resistor in series with C3. I assume this is R3. Is that right. I've switched out C3 and R3 to the values stated but still don't have this thing functional.

The relevant preference settings are as follows:
Extruder0_Beta: 3960
Extruder0_Rz: 337254
Extruder0_Capacitor: 0.0000000015
Extruder0_ExtrusionTemp: 240

I played around with these values some to see if they were the culprit but with no luck. I tried reducing hm and hb to lower values as per the page here:
[reprap.org]
Got the temperature up from 73 to 107 C. Still stuck at that point though.

My question is, What is the general problem I am encountering with this system? Why can I not go up above a given temperature? Is it a hardcoded value?

Demented]]> Demented Chihuahua Controllers Sun, 30 Mar 2008 19:36:00 -0400