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I'd like to buy a new nozzle for my Anycubic i3 Mega because it's not precise enough - it fails to print small details like 1 mm eyebrows.

Currently it has a 0.4 mm nozzle and I'd like to buy a better one but I don't know how to choose one which is compatible with this printer.

If you have any advice, please let me know.

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    $\begingroup$ Can you remove your 0.4 nozzle and post a photo of it? I would assume that any similar, compatible, nozzle with the same fitting would do, just use one with a smaller hole. You may need to change some print parameters, i.e. your print speed, but I'm not entirely sure about that. $\endgroup$ – Greenonline Apr 12 '19 at 18:05
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    $\begingroup$ There are 3 large styles floating around, differentiated mainly from the fitting: M7 with Teflon liner into the nozzle, M6 with a snub nose (e3d-style) and M6 with long body and nozzle ("chinesium") $\endgroup$ – Trish Apr 13 '19 at 8:01
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    $\begingroup$ Anycubic looks like a legitimate manufacturer, with a customer support department. Call or email them and ask about smaller diameter alternative nozzles. They may have nozzles to sell you, or they may give you the specs you need to buy a third party compatible nozzle. With the specs and @Trish's info, you can probably make a compatible choice. $\endgroup$ – cmm Apr 18 '19 at 15:33
  • $\begingroup$ correction of myself: till today, I encountered 2 Chinesium types that differ from which wrench they belong to (a size 7 or 8): to help differentiating, I put the differentiation into a related question. $\endgroup$ – Trish May 13 '19 at 14:14
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According to Anycubic this printer uses the E3D V5 type hotend as can be seen from the linked video of the AnyCubic Mega:

E3D v5 of Anycubic Mega exploded view E3D v5 of Anycubic Mega assembled view

The brass nozzle you see is fully compatible with the E3D v6 nozzle and can be found on those typical auction and Chinese websites by looking for "E3D nozzle". They are also available from E3D directly, the designer/creator of the E3D hotend family, and other specialized manufacturers like the Olsson Ruby. These nozzles have a short nozzle (snout) and are screwed into the heater block with M6 threads.1)

E3D v5/v6 nozzle

The smaller the diameter, the smaller the filament traces and the higher the print detail resolution. Note that a smaller diameter causes thinner walls for the same amount of (vertical) walls and may require additional perimeters to get similar strength and rigidity. The maximum layer thickness also decreases, as prints with a layer height above 75 % of the nozzle diameter have very poor quality. As an example, a 0.25 mm nozzle should not print layers thicker than $0.75 \times 0.25\text{ mm} = 0.19\text{ mm}$.

As such printing with smaller nozzle diameters increases print time. Also note that a smaller diameter requires more force to push the filament through and could use some extra temperature to make the filament more fluid or reduction of the print speed.

Just buy some spare nozzles of different nozzle diameter and experiment what works best for you.

1) - The other popular style of M6 threaded nozzles has a long body and long taper (often referred to as MK8 nozzle; they come in two different shapes). While these might work, they extend from the heater block considerably further and might need readjustment of the heater block (as explained here):
MK8 nozzle variant 1MK8 nozzle variant 2

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    $\begingroup$ sidenote: the nozzle for the e3d v6 and e3d v5 are pretty much unchanged in outer dimensions. IIRC the biggest difference was a better workflow. $\endgroup$ – Trish May 13 '19 at 13:13
  • $\begingroup$ Brass will wear out faster and clog more often. They should use a Swiss Micro stainless steel nozzle. $\endgroup$ – user77232 May 13 '19 at 13:30
  • $\begingroup$ @user77232 that is material dependent. for high abrasive, you even would use an Olson Ruby. $\endgroup$ – Trish May 13 '19 at 14:12
  • $\begingroup$ @user77232 Opposed to steel, brass conducts heat way more easily. I have had very few clogs in my brass nozzles, mostly self inflicted by too much temperature due to wrong filament choice in slicer. I've read that steel nozzles are more prone to clogging. I guess it depends on your experience. $\endgroup$ – 0scar May 13 '19 at 14:22
  • $\begingroup$ I meant that if he's going to be using a .2 nozzle then he should use steel. Decloging the nozzle tends to scratch the hole, which would wear it out faster. $\endgroup$ – user77232 May 13 '19 at 15:22
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While I don't own an Anycubic i3 Mega, after a bit of searching I am pretty sure that I have found what you are looking for.
My first search for nozzles yielded this result, which is a listing by Anycubic for replacement 0.4mm nozzles.
By looking at the specifications of these nozzles (M6 Thread, 7*12mm), I could then search for smaller nozzles.
After a small amount of searching, I found these nozzles. You would want the 0.25mm/1.75mm option.
They look to match the specifications of the official nozzles.
I hope this helps.

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  • $\begingroup$ Your first result is e3d-style $\endgroup$ – Trish Apr 18 '19 at 16:04
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We select nozzles depending on what project we want to,do and it must match with the hot end as well.

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  • $\begingroup$ Hi Donald, and welcome to SE 3D Printing! Whilst your answer may be technically correct, it is rather terse, and, as such, it has been recommended for deletion, unfortunately. If you could expand it then you may get a more positive response. I would recommend that in addition to reading some highly voted answers to gauge the standard expected, that you take a look at the help section relating to answering questions, in particular How to Answer, and take the tour for more information on how stack exchange works. Thanks :-) $\endgroup$ – Greenonline May 14 '19 at 13:28
  • $\begingroup$ Technically any M6 thread will fit in the anycube. $\endgroup$ – Fernando Baltazar Jul 6 '19 at 4:48

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