E3D Hemera integrated one piece Extruder. I want one on my MK3S  

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

I ordered it for my CR-10S Pro, but will not entertain it for my Prusa.  

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

@laura-f2

Changing some distance values in the firmware, I wouldn’t call a big firmware change. But I understand the wish to stay stock.

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

They have something now but it seems that it doesn't work with the MMU2S -> https://e3d-online.dozuki.com/Guide/Hemera+Prusa+i3+MK3+Upgrade/135?lang=en&fbclid=IwAR0yuwn6yOK7DXShmWRUEGPXAakmPJ6AgPNd6tyr1T-vQRMIl-ReZJXYEUI  

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

@charles-h13

Will be interesting to hear how it goes for the CR10. I have a CR10 mini as well as the mk3s, but only recently upgraded the mini to Titan + e3d v6 with the e3d compact motor. Its already a huge improvement on the Creality, PLA is every bit as good as the Prusa prints.  The only issue I have with CR10 now is the noise... Could see the Hemera being really good on that.

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

@dajmasta

You simply must be joking about the temperature. I can see the concern with engineering parts to fit the filament sensor, but I am sure other people have posted this on thingivurse.

May I remind you, that the majority of the parts on the existing prusa extruder are made of PETG. I can go into great detail and take apart every part on the hemera vs the stock extruder and show you just how insane that argument is. But I do not have to. Let me ask you a question, after watching bondtech struggle with people buying higher quality knock-offs from china ( see trianglelabs aliexpress ). Watching people, like myself make fun of bondtech for selling lower quality products at a higher price than their Chinese knock offs. Finally responding to the Chinese born BMG-aero with the Hemera, are they really going to waste their time by releasing an inferior product?

No.

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

Not really sure why you're jumping down my throat?  Also I'm not sure why you're bringing up other extruders that weren't mentioned and which I have no experience with?

I've had repeated problems with the stock MK3S (and even MMU2S) due to heat, and have since reprinted all the plastic parts of both in ABS to prevent further issues.  The Hemera has a single heatsink for all the heat transferred through the heatbreak and generated by the extruder motor (which is thermally coupled to it because of the all metal construction), and I don't want the combined heat generated to soften the mounts to the extruder carridge, the mount for the pinda probe (a common problem with the MK3S), or not have enough cooling capacity to prevent filament jams when ambient temperature is 30C higher than usual.

In any case, it was a concern having not seen many reviews or prints with it for a specific use case that isn't very common for people.  I've since been convinced enough to buy a Hemera (actually I got a first-run unit still branded Hermes), though I haven't had the time to try the mounts listed earlier yet - in the middle of a fair bit of printing and a pending move.  While I'd still like a solution for the filament sensor, I've given up on the MMU2S after even more unexplained loading issues - I print almost everything single material anyways (partly because of all the issues), so I'll just use my MK3S as a single filament printer until I can get my hands on a proper two extruder printer for support material.  The MMU2S has been much less reliable and much less compatible than the base MK3S in my experience, so I'm not totally sold on filament switching as a reliable alternative to multiple toolheads for the time being.

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

interesting that the Herrera may be the solution to many mmu problems, but won’t work with it.

I’m going to wait for something more official, but what I really hope is that the next Mk has some kind of modularity to the print head.  Being able to swap heads, or really being able to take a head off to work on it while putting in a spare will be part of my next upgrade if I have to do it myself.

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

Oh, I'm not expecting it to be the solution, I don't know of a filament sensor adaptation for the Hemera yet that would even let it operate with the MMU2S, I've just given up on the MMU2S and am going back to a single extruder.

While it's a different topic for a different thread, I had some issues with the MMU2S system that could have been extruder related, especially when it came to trying to print flexibles or softer support filaments (which are not officially supported by the MMU2S), but most of the issues that lead to me taking it off were with the filament sensor on the extruder or with faults in the unit itself.

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

@dajmasta

Sorry about that, it seems that many people feel I personally attack them. This is unfortunate as it is not my intention. Smart people can say stupid things, the difference is the stupid people do not dare to say things that could be smart at risk of sounding stupid. Just because I attack something you said does not mean I have any ill will to you. Ideas and people are independent to me.

Strangely enough I have seen people with NO issues with the MMU2. Strange as the design is a poor candidate for production as there are many shortcomings that prevent it from being reliable over many units. Even briefly looking at it you can see it was made with far too many assumptions. Would love to see Prusa thoroughly examine problem units like yours.

Fortunately the hemera is not thermally coupled to the heat-break. The common surface area is too low and the way the faces are flat and exposed the heat would never cross contaminate. E3D likely did thermal simulation to arrive at this geometry, their curiosity being peaked with the unexpected cooling with titan aqua. Slice mosquito is an excellent example of what I am talking about, because of the high surface area, low cross sectional area per strength rating, low thermal capacity and moderate specific of the steel they use eliminates the ability of heat transferring up.

If you do not believe me, the hemera files are on thingivurse. Fusion 360 simulation allows you to confirm my results for free.

The heat of the stepper is still a concern, but not particularly because of heat creep. The stepper is likely too strong for this because of the short feed distance unless it reached the drive gears. Steppers simply do not like heat, they will have a shorter service life and produce less power at higher temperatures. Overall, your steppers should all have passive aluminum heat-sinks. Heated chamber require a thermostat. At or above 60C water-cooling should be a major consideration, at or above 80C it is an absolute necessity. Trianglelabs and dyze design both have water cooling blocks compatible with nema-17. The design of hemera is even conducive to rough chiseling off the fins, sanding the remains flat and slapping a second water-cooler on the front. Have you a belt sander and a chisel would not be necessary as the cast aluminum would simply appear to evaporate.

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

@jmone

See https://e3d-online.dozuki.com/c/Hemera_Printer_Upgrades

for more details

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

Regarding concerns for running Hemera in an enclosure ...  Hemera has an aprox 3:1 gear ratio. Doesn't that mean it should run cooler than the standard MK3 extruder?

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

@wdfitzpat

I've seen steppers running in production machinery 24/7 at 80C+ without any problems. You need to check the stepper manufacturers specs for service temperature range. Some of the cheap Chinese ones will fail quite quickly at those temperatures but quality ones generally aren't a problem. E3D list the service temp for the motor at 85C. The Noctua fan is only 50C however..

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

Been looking at the E3D solution for fitting one to a mk3s and it's not inspiring. Loss of the filament sensor and the increase in the PINDA offsets are going to be a big no for many. I'm printing out the linked mount adapter then the original extruder at the moment then I'm going to see if I can design a better solution. 

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

Interesting thread. It seems the Hemera is just too new to be fully supported for the Prusa, specially the MK3S. I am currently looking for an extruder upgrade to make my extrusion more consistent.  First I was looking at the Bondtech BMG upgrade, but then the Hermes came along and now I am in doubt which one to buy.

The bondtech does have better support atm, like for the MK3S, you dont loose any of the prusa features (pinda and filament sensor), and they provide an already pre-compiled firmware.

The Hemera doesnt really support the mk3s yet, have to compile my own firmware and cant really find images of print examples using a prusa.

I hope things will continue to develop for the MK3S, its hard to buy the Hemera knowing I will be loosing some of my MK3S features.

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

Because of the Hemera design the stepper body would have to be to the side, rather than forwards, but I'm not sure if that would reduce the x axis available movement. I suspect it would. If you kept the nozzle in the same position central to the carriage you would have around 32mm more width on the stepper side. The filament sensor could be integrated above it, but it would end up further away from the extruder than the current one.

To be honest I'm inclined to think a complete redesign of the x carriage would be needed and I'm not sure the effort required is worth any gain.  

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

@ido-d

Agreed - remains to be seen for me if the Hemera is worth the loss of print bed size, pinda offsets and filament sensoring.

Its probably excellent for some other printers, but as I have discovered with other printers, loss of even a couple of mm on the bed makes a hot end far less attractive.  Bondtech is probably a better buy right now, they mod the latest Prusa firmware themselves for it.

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

It also depends what you need and how much you want to spend. The stock Prusa HotEnd is still the best allrounder IMHO. BMG costs twice the price of Hemera. And Hemera need someone or bigger community which makes/improves all the mounts and provide the firmware updates. 

I put Hemera on my i3 clone and will use it there for the time being. The first impression is good but at the end of the day the only benefit is faster/better print with FLEX filament. Which is something I'm not doing very often. 

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

Posted by: @nikolai-r

 BMG costs twice the price of Hemera. And Hemera need someone or bigger community which makes/improves all the mounts and provide the firmware updates. 

It depends, if you are looking to upgrade your existing extruder the bmg is cheaper (€118 vs €127).

Community is also important indeed. The hemera is still young and it also has to be seen if its the best upgrade for a prusa printer i guess. At this moment in time the bmg seems the better fit.

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

@ido-d

The reviews I've seen of the regular BMG upgrade kit were not really overwhelming. I was referring from stock Prusa extruder to the BMG Mosquito upgrade. This is where I see the most benefit of the upgrade. Maybe BMG will also offer Hemera upgrade in the future. 

RE: E3D Hemera integrated one piece Extruder. I want one on my MK3S

A few people have mentioned the firmware - those changes are relatively easy to do. You would have to change the pinda probe X and Y offset values in config.h to suit the new values and reflash. The esteps per mm changes to 786.5 and can be changed via Pronterface using the M92 command.