FYSETC Prus i3 Hotend MK3S+ J-Head Extruder Kit 24V 40W for 1.75mm Direct Filament Compatible with Prus i3 MK3/MK3S/MK3S+ and Other E3 V6 Remote Printhead Printer with Silicon Cover and 0.4mm Nozzle

As part of the process of evolving a i3 clone (as in, the Mk1) into a "real" Prusa (something adjacent to the Mk3S), I recently bought this J-head as the e3d v6 clones I had on hand would not fit into Prusa's R7 Mk3S extruder geometry, those using screwed-in PC4 couplings instead. While I've bothered to get some of the hardware from Prusa directly, doing this for all parts would get too expensive too fast, so I chose to source the hotend (along with some other components) from Fysetc. The Fysetc J-head came fully assembled (minus PTFE Guide, which you trim and insert yourself) and even apparently heat tightened, which was a pleasant surprise- I am used to v6 clones usually only being hand tightened, if tightened or even assembled at all. This made the process of assembling the extruder similar to assembling the official extruder out of the official kit; simply cut the PTFE guide to length, insert it into the hotend, then put the hotend into the extruder back, align cables and place the front parts of the assembly onto it and tighten. A thing I will note is that the PTFE tube it came with fits and allows filament through, but seems to have a very tight inner diameter and seems stiff for PTFE. I'm sure it'd work fine, but I however used some of my own PTFE with a 1.8mm inner diameter instead. In terms of function it's still early days, but while I have issues with other parts of the older hardware, this hotend and the extruder as a whole has functioned very well. Even running with a 12v heater cartridge (the machine has yet to be converted to 24v as I do not yet have the 24v hotbed) it reaches (and overshoots) temp quickly (2-3 minutes or less from 17 C to 215 C). This causes a noticeable amount of oozing and stringing when printing with PLA, and possibly a bit of over-extrusion, but in my experience this is to be expected with all-metal hotends, so dropping print temps 10 degrees on the hotend is recommended. I would also advise others using the hotend to run some PID tuning as well. Generally, the oozing has not been a problem for me (I have larger problems like a bent leadscrew and sensorless homing sometimes acting weird) other than top surfaces looking a over extruded, but this can probably be fixed with further tuning of the printer and print settings.All in all, while I was prepared to get something similar to the usual cheap v6 clones, this was a pleasant surprise, and a good value.

It’s too early to tell how long this will last considering I have not even finished printing the first part yet but so far it is extruding prusa pteg filament really well.I initially had the original prusa hotend on order but the shipping date kept pushing out even a week after my purchase so I couldn’t wait any longer and took the leap of faith with this brand.If this holds well I will be a repeat customer.

It works, but my only warning is to make sure that the insides are clean. I was fighting some inconsistent extrusion issues, then realized that there must be a partial clog... probably a metal filing. Heated it up, and replaced the nozzle w/ another one, and it is feeling much better. So, it isn't expensive, but just keep in mind that it isn't an E3D either. It went together easy, long wires, so no issues or real complaints on my part.

99.9% identical to the original Prusa hotend assembly, with 2 differences visible upon inspection. The first difference is the thickness of the heat-sink ribs. They just barely perceptibly thinner ... we're talking, like, a micron. But FYSTEC improved the durability of the original thermistor wiring which was preposterously delicate. In this version the hairlike threads coming out of the probe are protected in a plastic sheath! Yay.All told, I'm quite pleased with this purchase. It arrived faster than expected, installed as expected. And after a new layer calibration performs equal to the original and I'm able to print once again.Given the value, I might just order another as a backup.

Easy to install and works great.

No problems installing and the first print with it is working just fine. I guess we will see how things go.

Spent the last 2-3 days trying to figure out what's going on with my prints. None of them came out right. I was hoping this would be better for a fraction of the price they sell these in PRUSA.