1 Topic by labguy

  • labguy
  • Member
  • Offline
  • Registered: 2013-06-15
  • Posts: 14

Topic: What is the white cement on heat core?

Hi Everyone,

I was clearing a clog on my SD2 hotend and broke away the white cement paste stuff from the core. Can anyone tell me what exactly that stuff is so I can pick some up (image attached)? In fact, is it critical to the assembly?

Thanks for the advice.

Jeff

Post's attachments

core.jpg
core.jpg 153.67 kb, file has never been downloaded. 

You don't have the permssions to download the attachments of this post.

2 Reply by Ski52

  • Ski52
  • Ski52
  • Member
  • Offline
  • From: Florida USA
  • Registered: 2013-10-23
  • Posts: 332

Re: What is the white cement on heat core?

Can't tell you exactly what it is, but I did the same, and repaired it quite well with plain-ole-JB Weld.  Worked great till I replaced the hot end with an E3D.  A lot cheaper than some thermal compound.  Give it a try..

Ski

Ender 3 Pro

3 Reply by jagowilson

  • jagowilson
  • PRINTiT
  • Offline
  • Registered: 2014-09-14
  • Posts: 1,701

Re: What is the white cement on heat core?

I think it's cement but if everything is properly strain relieved I don't believe you need it anyway. Maybe run a pid autotune just in case it affects temperature a bit.

4 Reply by labguy

  • labguy
  • Member
  • Offline
  • Registered: 2013-06-15
  • Posts: 14

Re: What is the white cement on heat core?

JB Weld...brilliant! Thanks for the pro-tip! I certainly will get an EV3. I even printed out the parts to receive a EV3v6 just last week.

I've never done a PID autotune, but will give it a go since the current hotend is actually slightly upgrade from the original. I was looking at these PID tuning instructions:

http://wiki.solidoodle.com/pid-autotune … luctuation

It's interesting that they run it with the hot end cold. I would think that you'd want to bring it up to the desired temperature (195 C in my case) and run it.



Jeff

5 Reply by jagowilson

  • jagowilson
  • PRINTiT
  • Offline
  • Registered: 2014-09-14
  • Posts: 1,701

Re: What is the white cement on heat core?

The PID autotune cycles as many times as you request, so the actual tuning happens at temperature. I use 8 cycles. The more cycles, the better your PID calibration will be up to a limit

6 Reply by carl_m1968

  • carl_m1968
  • carl_m1968
  • Member
  • Offline
  • From: Far North almost not Dallas
  • Registered: 2014-10-17
  • Posts: 6,512

Re: What is the white cement on heat core?

labguy wrote:

JB Weld...brilliant! Thanks for the pro-tip! I certainly will get an EV3. I even printed out the parts to receive a EV3v6 just last week.

I've never done a PID autotune, but will give it a go since the current hotend is actually slightly upgrade from the original. I was looking at these PID tuning instructions:

http://wiki.solidoodle.com/pid-autotune … luctuation

It's interesting that they run it with the hot end cold. I would think that you'd want to bring it up to the desired temperature (195 C in my case) and run it.



Jeff

I believe the temperature ramp time is also figured into the PID calibration as well. That is why they start cold.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

7 Reply by madkow007

  • madkow007
  • Member
  • Offline
  • From: Wisconsin
  • Registered: 2015-02-08
  • Posts: 94

Re: What is the white cement on heat core?

I have tried to run the PID autotune with a cold extruder and it would time out every time (on an SD4).

Pre-heat the extruder to your desired temp, then turn it off and run the M command immediately after...

M301 Sxxx C8 - where xxx = your desired temp. the C8 tells it to run 8 times - i think the default run is 3 times?

This method has worked great for me and I get pretty good results with the changes made.

SD4 with Lawsy carriages, Rumba board, & new 12v PSU, E3D v6, mirror bed plate, X motor fan.
Stock SD4
Prusa i3 kit, spring loaded extruder upgrade, Y axis belt tensioner