So I just assembled my new Ultimaker today and did a test print,

3D Printing
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1

So I just assembled my new Ultimaker today and did a test print, I started to notice some of the green plastic leaking out on the hot end, any ideas on how to fix this?
Thanks in advance!

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2

Let’s ask @Daid_Braam !

3

Tighten that then run some abs through at higher temps.

4

Good idea, but I don’t have any abs right now.

5

I’m not sure how the ultimaker hotend goes together, but I know a few extruders have some kind of thread locking sealant to prevent this. You could try putting that on the threaded parts where the plastic is leaking.

6

Like Teflon tape? Would it melt?

7

Yeah, it screw’s together but there wasn’t any kind of sealer…

8

Whatever you use, it should probably be rated for high temps. I think there is some sort of teflon tape on my hotend.

9

I just did a little research and I think Teflon take will hold up under heat, I also found this hi temp anti sieze stuff that looks like it’ll work to

10

You should have got some PTFE tape with the machine. You wrap a tiny amount around the bottom of the thread between the heater block and the nozzle. Also you need to make sure the heater block is nice and tight against the brown plastic section.

11

Awesome thanks!

12

Never needed any tape or sealer on my Stepstruder MK7 and haven’t had any leaks. I make sure I do the final tightening with the hotend heated.

13

Yeah, it might be a little loose. I bet tightening it will fix it.

14

Try tightening while it’s hot. I got melted pla in the threads of my hot end. It won’t tighten very much at all anymore until it’s at extruding temperature because the plastic is blocking the threads. I removed the plug from the hot end, heated it without filament in it, and very carefully tightened the thread. I used a needle nose, but had to use my bare fingers on the peek tube of my hot end. Good luck

15

Thanks

16

Suprised they don’t use NPT style threads for the nozzle and body. These are tapered, and designed for liquid tight connections.

17

It’s really difficult to control the depth of a pipe tap so trying to control the height of the nozzle would be really difficult with an npt thread