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I am thinking about getting into the 3D printing craze and currently looking at purchasing a Creality Ender 3 V2 as an entry-level unit. I would like to print using the normal PLA, PETG, ABS, etc. but I'm also thinking of metal-infused PLA or similar for printing jewelry. The suggested modification that I have found in researching is the Micro Swiss All Metal Hotend in order to reach the higher temps for printing metals.
Am I correct with this additional mod? Are there other Hotends that would better? Any additional mods for working with metals?

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    $\begingroup$ What do you mean by "metals"? You can get PLA infused with metal particles that looks vaguely metallic, and shouldn't need any special equipment for it, but you cannot print actual metal with a normal FDM printer. Real metal printers need high power lasers to melt metal powder and cost tens of thousands of dollars. $\endgroup$ – R.. GitHub STOP HELPING ICE Aug 12 '20 at 2:39
  • $\begingroup$ Yes, I was looking at using infused PLA. I will edit to clarify. $\endgroup$ – agarza Aug 12 '20 at 3:02
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There is a lot of misinformation in the 3D printing world about "all-metal hotends" being an upgrade. Some of them, especially clones, are not even all-metal but just poor lookalikes that create all sorts of problems. But even if you get a real one, it's a trade-off, not an upgrade. It lets you print materials that need a hotend temperature over 250 °C (over which the PTFE liner will begin to degrade and possibly release small amounts of harmful gasses) up to the temperature your heating element can achieve, at the cost of losing the extremely-low-friction PTFE pathway all the way to the nozzle, which aids with smooth extrusion and retraction and avoids jams. Depending on your particular all-metal hotend, it may be harder to get retraction working correctly than with a normal PTFE-lined one. Some users report very good results, others lots of problems.

There are very few materials that need temperatures over 250 °C to print that don't also need a much more expensive machine (or at least a heavily-modified one) for other reasons, such as requirement of a high-temperature enclosure. The main materials that can be printed on an Ender 3 with an all-metal hotend but not the standard PTFE-lined hotend are polycarbonate (needing 255-300 °C) and some forms of nylon (which may need up to 250-270 °C). All the other non-exotic materials, including PLA, ABS, PETG, and TPU, and even some exotic ones like POM (aka delrin or acetal) and many nylons, can be printed just fine with a stock Ender 3 (possibly with a minimal enclosure built around it).

In particular, for the purpose you want - printing metal-infused PLA - there is no point whatsoever in an all-metal hotend. Metal-infused PLA is printed within the temperature range of PLA, which is typically 230 °C at the absolute highest (and preferably much lower) and the printer you're looking at should print it just fine out-of-the-box (or rather, once you assemble it).

If you're concerned about abrasive wear from the filament, this affects the nozzle not the hotend. Technically the nozzle is "part of" the hotend assembly, but it's easily removable and generally considered a consumable item that you replace periodically. You can get hardened steel nozzles and all sorts of other exotic replacements designed not to wear out from abrasive materials, but the standard brass has the best thermal (heat conduction) properties and is so cheap you're generally better off sticking with it and buying a pack of 20 or so to have on hand when they eventually need replacement. In any case, there's no need to replace the hotend with an all-metal one to deal with nozzle wear; you can get either type of replacement to fit the original one.

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    $\begingroup$ Yes, metal-filled or even wood PLA will damage your nozzle. As long as you don't plan to print higher-temp materials (Nylon, Polycarbonate), a hardened nozzle will be sufficient without the potential drawbacks of an all-metal hotend. youtube.com/watch?v=uvlMeTnjriQ $\endgroup$ – towe Aug 12 '20 at 4:39
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    $\begingroup$ @agarza: No, the misinformation I speak of is the claim that all-metal hotend is "an upgrade" and something you're "supposed to do" to improve your printer rather than something you do only because of a very specific need. It's not misinformation that certain filaments will damage the nozzle quickly, but that's completely unrelated to your question about an all-metal hotend. If you're using abrasive filaments you either replace your brass nozzles frequently (they're dirt cheap so this is no problem) or buy a steel nozzle. (Steel is also a trade-off since brass has better thermal properties.) $\endgroup$ – R.. GitHub STOP HELPING ICE Aug 12 '20 at 5:08
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    $\begingroup$ To clarify since I realized it may not be obvious: the nozzle is a replaceable part of the hotend, generally considered a consumable. You can get all sorts of different sizes and materials of nozzles for the original hotend that comes with your printer. $\endgroup$ – R.. GitHub STOP HELPING ICE Aug 12 '20 at 5:20
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    $\begingroup$ You do not need to change your hotend for ABS either. Or for PETG, or for TPU, or even POM (delrin) or many nylons. Of things printable without an extreme machine, pretty much only PC (polycarbonate, 255-300) and some high-temp nylons (250-270) need an all-metal hotend. $\endgroup$ – R.. GitHub STOP HELPING ICE Aug 12 '20 at 6:35
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    $\begingroup$ Thanks for marking my answer accepted. I've incorporated the useful information I added in comments, so it's much more thorough now. $\endgroup$ – R.. GitHub STOP HELPING ICE Aug 12 '20 at 18:51

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