5

If the hotend is okay, consider yourself lucky and consider the nozzle a loss. Aside from specialty items like ruby tip ones, nozzles are a consumable anyway. Even if you can clean it out well enough to get it working again, it's unlikely to extrude as well as a new clean nozzle. Acetone is probably not going to help; PLA does not dissolve in acetone, and ...


4

How does this happen? For melted filament to leak around the heat break threads, it has to first get through the metal-to-metal machined surface joint where the heat break contacts the nozzle. Given this keeps happening, the problem must be a systematic error of some kind. Thermal Cycling Based on your description of your installation procedure (heat to 285 ...


3

Given your heatbreaks are the same material and external dimensions, it seems that the most practical way to distinguish one from the other would be to mount the all metal heatbreaks in a heat sink that's anodized to some other color than natural aluminum -- red or blue, for instance. If you can't buy them that way, or already have plenty on hand, anodizing ...


2

The drop-in replacement all metal hotends for the Ender 3 that I've looked at seem to have the two screws -- though I've read/heard opinions that these are intended to be removed after assembly, these are common Mk. 8 type hot ends, but with 2 mm bore through the entire heat break instead of 4 mm. That seems to be the only modification (other than not ...


2

All-metal hotends are less forgiving Yes not as good for PLA No but how bad? That is very subjective and totally depending on the skill of the 3D printer operator! So, that part of the question cannot be answered. Fact is that all-metal hotends are sold as being upgrades to lined versions, this is simply not true. It is a different design that ...


2

Verification: When you tighten the nozzle against the heat break, the nozzle is not tightened completely against the heater block. If the nozzle tightens completely against the heater block, it will not finish tightening against the heat break. Note: the heat break is thin between the heater block and heat sink to minimize conduction of heat. Over-...


2

You can get a suitable board for $20 or so, print a case for a few cents, and either repurpose an old PC power supply or buy a new one just powerful enough for the hotend (not bed) heater very cheap, so I think it's a lot less costly than a cheap printer, and cobsumes less space. But I'm not clear what you need it for.


1

Even if it works properly (which it seems not to do), this type of thermistor will only have a resistance of around 100 Ohms at 350°C, which is too low to be useful in your printer. It is rather suspicious that the seller does not specify an accuracy for the thermistor, so it is probably of a low accuracy, which will make things even worse. I am not ...


1

As suggested in comments, I've installed Luke Hatfield's captive PTFE tube fix using high temperature Capricorn PTFE tube inside the heat break, and this seems to have solved the problem, while accomplishing the main thing I wanted an all metal hot end for: allowing higher print temperatures for filaments that require it. In my case, I had to modify the ...


1

You ask in general, not specifically for Ender, so since you mention the Mosquito, which has a characteristic shape and a size, the obvious alternative which doesn't cost that much is the Phaetus Dragon. It copies the idea of the Mosquito, but it is repackaged in a shape and size fully equivalent to standard v6 hotends so it's a drop-in replacement for any ...


1

PETG does not need an all-metal hotend or alternate bowden/lining material. Unless you're trying to print at #speedboatrace-competitive speeds, the recommended print temperature range for PETG is 230-250 °C, and the temperature above which you should not use a PTFE-lined hotend is 250 °C.


1

Are they so bad I should plan on changing back to a PTFE hot end? No, all metal hot end are not that bad, and may even be beneficial when printing at higher temperatures. You mentioned that you want to print ABS and other such materials. At temperatures this high, my understanding is that the PTFE tube in the hot end may melt, or at least become so damaged ...


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