Hi, my first prusa is almost ready to start printing (need a cap, MOSFET, and endstops). I have my hot end essentially done, I am using wildseyed simple hot end. I have the power resister mounted to the aluminum via heatsink compound. But I am unsure of how to mount the thermister. Where and how should it be mounted? Thank you A kungfu mastah https://reprap.org/forum/read.php?70,90771,90771#msg-90771 Sat, 12 Sep 2026 01:29:00 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?70,90771,91875#msg-91875 https://reprap.org/forum/read.php?70,90771,91875#msg-91875 a kungfu mastah Plastic Extruder Working Group Mon, 25 Jul 2011 16:51:50 -0400 https://reprap.org/forum/read.php?70,90771,91839#msg-91839 https://reprap.org/forum/read.php?70,90771,91839#msg-91839 SCphotog Plastic Extruder Working Group Mon, 25 Jul 2011 13:36:40 -0400 https://reprap.org/forum/read.php?70,90771,91833#msg-91833 https://reprap.org/forum/read.php?70,90771,91833#msg-91833 a kungfu mastah Plastic Extruder Working Group Mon, 25 Jul 2011 12:48:29 -0400 https://reprap.org/forum/read.php?70,90771,91775#msg-91775 https://reprap.org/forum/read.php?70,90771,91775#msg-91775 SCphotog Plastic Extruder Working Group Sun, 24 Jul 2011 20:32:05 -0400 https://reprap.org/forum/read.php?70,90771,91734#msg-91734 https://reprap.org/forum/read.php?70,90771,91734#msg-91734 -------------------------------------------------------
> If you want to maximize the heat transfer,
> you can apply thermal compound like what is used
> on PC heat sinks.

Arctic silver becomes quite conductive when heated so it probably a bad choice. Other cheaper heat sink compounds work well.]]> Greg Frost Plastic Extruder Working Group Sun, 24 Jul 2011 07:49:26 -0400 https://reprap.org/forum/read.php?70,90771,90962#msg-90962 https://reprap.org/forum/read.php?70,90771,90962#msg-90962
The aluminum is held to the brass using a set screw. If you want to maximize the heat transfer, you can apply thermal compound like what is used on PC heat sinks.]]> jcabrer Plastic Extruder Working Group Mon, 18 Jul 2011 00:20:08 -0400 https://reprap.org/forum/read.php?70,90771,90945#msg-90945 https://reprap.org/forum/read.php?70,90771,90945#msg-90945
Also what adhesive should be used between the aluminum block, and the brass coupling?

A kungfu mastah]]> a kungfu mastah Plastic Extruder Working Group Sun, 17 Jul 2011 18:22:35 -0400 https://reprap.org/forum/read.php?70,90771,90820#msg-90820 https://reprap.org/forum/read.php?70,90771,90820#msg-90820
I'm glad to hear you are using the Wildseyed (it's my design). Did you have a look at my build instructions on the wiki?

The thermistor glass bead need only touch the block AND copper MIG tip where they meet on the bottom. What I usually do is spread the wires about a half inch apart, and wrap then in kapton tape, right up to and including just a bit of the glass bead, to avoid any shorts. Three or four layers of kapton should be enough.

In my instructions, it shows me using Rescue Tape to secure everything to the aluminum block, but I don't do this any more, as it does not hold up when printing ABS (250C). Now I use kapton to wrap everything. About 6 layers is good, You want to totally insulate the block, resitor, and thermistor, but NOT the brass. that needs to be open to the air so it can bleed off excess heat.

I will be updating the instructions and pictures later this weekend when I build another tip.

Let me know if you have any specific questions beyond this.

-Wildseyed-]]> jcabrer Plastic Extruder Working Group Sat, 16 Jul 2011 20:40:33 -0400 https://reprap.org/forum/read.php?70,90771,90771#msg-90771 https://reprap.org/forum/read.php?70,90771,90771#msg-90771
Thank you

A kungfu mastah]]> a kungfu mastah Plastic Extruder Working Group Sat, 16 Jul 2011 11:17:11 -0400