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Replacing red wires broken off hot end MK3  

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daniel.t22
(@daniel-t22)
New Member
Replacing red wires broken off hot end MK3

Hi there,

Whilst replacing the nozzle on my MK3, the ends of the two red wires which connect to the hot end broke off.

I was wondering if anyone could advise the best way to fix/replace them? I saw in an MK2S forum that you can buy replacement 'quick-release wires' – although I don't actually know the official name for these red wires to find them.

Many thanks

Posted : 22/08/2018 1:29 pm
RH_Dreambox
(@rh_dreambox)
Prominent Member
Re: Replacing red wires broken off hot end MK3

If the wire has gone off just where it enters the heat cartridge, you can not fix it. You can order a new one in Prusas shop. But you must log in to purchase a new Heater Cartridge.

https://shop.prusa3d.com/en/mk3-printer-parts/384-mk3-e3d-40w-heater-cartridge-24v.html

Bear MK3 with Bondtech extruder...
Posted : 22/08/2018 3:41 pm
nathan0876
(@nathan0876)
Estimable Member
Re: Replacing red wires broken off hot end MK3

Yeah if its right at the heater cartridge you wont have anything to attach new wires to.

Also, since this is the heater cartridge soldering would be a poor idea, wires may get hot enough to melt the solder. If there is a bit of wire left to attach to make sure you use a mechanical connection not solder.

Posted : 22/08/2018 4:59 pm
RufusClupea
(@rufusclupea)
Reputable Member
Re: Replacing red wires broken off hot end MK3


If the wire has gone off just where it enters the heat cartridge, you can not fix it. You can order a new one in Prusas shop. But you must log in to purchase a new Heater Cartridge.

😕 ❓ Aren't these printers supposed to be "open-source"? Shouldn't all the non-printed hardware components have off-the-shelf availability?

....Or am I misunderstanding something? (Quite possible 😳 )

That's "MISTER Old Fart" to you!...
Posted : 22/08/2018 5:23 pm
RH_Dreambox
(@rh_dreambox)
Prominent Member
Re: Replacing red wires broken off hot end MK3

That's right, but if you want to buy a spare part with the right voltage, right cable length and proper contact, Prusa Shop is probably the right source.

Bear MK3 with Bondtech extruder...
Posted : 22/08/2018 5:44 pm
RufusClupea
(@rufusclupea)
Reputable Member
Re: Replacing red wires broken off hot end MK3


That's right, but if you want to buy a spare part with the right voltage, right cable length and proper contact, Prusa Shop is probably the right source.

Y...e...a...h.... that's my point. If it's open-source, shouldn't spare parts with the right voltage, right cable length and proper contact be available off-the-shelf from other suppliers? Prusa Shop is convenient (for some), but as has been pointed out repeatedly, not so convenient for those of us a hemisphere away, especially when shipping can cost several times what the part costs.

If Prusa has a monopoly on (certain) replacement parts, that's not "open-source" (at least in my mind).

As an open source project designers are free to make modifications and substitutions, but they must reshare their improvements. -- https://en.wikipedia.org/wiki/RepRap_project#Hardware

....Or am I misunderstanding something?

That's "MISTER Old Fart" to you!...
Posted : 22/08/2018 6:54 pm
Kazibole
(@kazibole)
Eminent Member
Re: Replacing red wires broken off hot end MK3

Y...e...a...h.... that's my point. If it's open-source, shouldn't spare parts with the right voltage, right cable length and proper contact be available off-the-shelf from other suppliers?

I believe it is just the standard E3D V6 24V 40W heater cartridge, with the appropriate connector on the end (correct me if I am wrong!): https://e3d-online.com/heater-cartridge-24v-40w

Posted : 22/08/2018 8:18 pm
RufusClupea
(@rufusclupea)
Reputable Member
Re: Replacing red wires broken off hot end MK3


I believe it is just the standard E3D V6 24V 40W heater cartridge, with the appropriate connector on the end (correct me if I am wrong!): https://e3d-online.com/heater-cartridge-24v-40w

Well, that would be a little better. At least E3D has some trading partners/dealers on this side of the pond.

That's "MISTER Old Fart" to you!...
Posted : 22/08/2018 8:47 pm
JoanTabb
(@joantabb)
Moderator
Re: Replacing red wires broken off hot end MK3

Open source doesn't mean exactly the right part will always be supplied, cut to the right length and fastened to exaclty the correct connectors..

it means, the designer used common parts that are described within the solution. in this case it's a standard heater capsule, attached to flexible wires via an insulated junction, with crimped ferrules on the ends of the wires where they connect to the controller all of the components are standard, if you want them prepared to the exact Prusa specification, then you need to go to Prusa.

the E3dv6 heater, comes in two power ratings and two voltage ratings, giving a total of four options

if you have a mk1, mk2, mk2s or mk2.5 with the original 12 volt powersupply, then you should select the most appropriate 12 volt heater, 30 watts is safer, takes longer to heat up, so the PID works with reduced overshoot. however 30watts may not be enough for higher temperatures with exotic filaments,

if you have a mk3, then you will have a 24volt powersupply, so you need a 24 volt heater... looking at my mk3 printer I see RED wires going to the Einsy board, so I believe my original heater is 24volt, 40watt.

ALL of the E3d heaters come with long wires, without ferrules, because E3d make them as universal replacements,

there are E3d resellers in many countries, I suspect some will be able to ship for less than Prusa...

however if you want an assembly, cut to the right length with the right connectors already fitted, then you are pretty much limmited to Prusa or a reseller

If you are feeling lucky, you could try ebay or aliexpress

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 22/08/2018 9:02 pm
brims
(@brims)
Eminent Member
Re: Replacing red wires broken off hot end MK3



If the wire has gone off just where it enters the heat cartridge, you can not fix it. You can order a new one in Prusas shop. But you must log in to purchase a new Heater Cartridge.

😕 ❓ Aren't these printers supposed to be "open-source"? Shouldn't all the non-printed hardware components have off-the-shelf availability?

....Or am I misunderstanding something? (Quite possible 😳 )

The hardware would be open hardware which has a similar ideology to open source but by the nature of the 2 they can't be exactly the same. Open source you can download the source files and compile, open hardware means you can download the schematics, board files, etc and make your own.

Posted : 22/08/2018 9:31 pm
RufusClupea
(@rufusclupea)
Reputable Member
Re: Replacing red wires broken off hot end MK3



😕 ❓ Aren't these printers supposed to be "open-source"? Shouldn't all the non-printed hardware components have off-the-shelf availability?

....Or am I misunderstanding something? (Quite possible 😳 )

The hardware would be open hardware which has a similar ideology to open source but by the nature of the 2 they can't be exactly the same. Open source you can download the source files and compile, open hardware means you can download the schematics, board files, etc and make your own.

My understanding is that it goes further than that.
"The license shall allow for the manufacture, sale, distribution, and use of products created from the design files or derivatives of the design files."
What’s the definition of “Open Source Hardware?”

IANAL, however I interpret that to mean that such products can be the same, and that 3rd parties may manufacture, distribute and sell such products--legally (unlike some products mfd in China)--on the open market.

That's "MISTER Old Fart" to you!...
Posted : 23/08/2018 12:22 am
gary.b
(@gary-b)
Trusted Member
Re: Replacing red wires broken off hot end MK3

RufusClupea
The manufacturer of the heater has no idea where/how it will be used. They give you what is typically extra wire length that works in most applications.
They don't attach contacts at the end because that would personalize it to a specific application and that might not work with say Prusa's application.
I would imagine that Prusa receives them just as Joan's post shows. They then cut the wire to the length required for a specific printer and attach contacts for the controller that will be used in that printer.
It is an OFF THE SHELF standard heater available from mulitiple sources which, to me, maintains the spirit of open source.

Gary

MK2S & Mk3 my mini farm is alive :lol:...
Posted : 23/08/2018 9:50 pm
RufusClupea
(@rufusclupea)
Reputable Member
Re: Replacing red wires broken off hot end MK3

I think we're essentially in agreement. According to the open-source hardware license as I understand it, exact replacements can (and that's the operative word) be mfd and sold. I did not know Prusa modified it, but the modifications are available & relatively simple, and as the number of Prusa printers increases in the western hemisphere, I think the likelihood of some shop (or more) selling the modified part will also increase.

We've established that the part is available off-the-shelf. I acknowledge not every person can--or wants to--modify the part, but if economics was a factor in their decision to build vs. buy assembled (as mine was, but not the only factor) I would think they'd also be willing to measure wires, clip them, and attach connectors to save on overseas shipping.

I just checked with USPS. The cheapest I can send a $10 part to the Czech Republic is ~$35 (flat-rate 6-10 business days). If we assume the same rate in the other direction, that $10 part is going to cost $45. For that amount, I can buy the part, domestic shipping, the connectors, the tool to crimp them on (I already own wire cutters and a ruler), and still have enough left over to get take-out for the 2 of us. 😀

That's "MISTER Old Fart" to you!...
Posted : 24/08/2018 3:17 am
gary.b
(@gary-b)
Trusted Member
Re: Replacing red wires broken off hot end MK3

Well once you have the crimper and contacts maybe you could become the local source for the heaters. 😀
It would be great if someone in the U.S. stocked Prusa spares. I agree that shipping charges take a $10 part and turn into a $45 part.
I bought a spare heater without the contacts and plan on splicing and soldering the old contacts on if the original dies.

MK2S & Mk3 my mini farm is alive :lol:...
Posted : 24/08/2018 4:02 pm
nathan0876
(@nathan0876)
Estimable Member
Re: Replacing red wires broken off hot end MK3


Well once you have the crimper and contacts maybe you could become the local source for the heaters. 😀
It would be great if someone in the U.S. stocked Prusa spares. I agree that shipping charges take a $10 part and turn into a $45 part.
I bought a spare heater without the contacts and plan on splicing and soldering the old contacts on if the original dies.

Since he damaged it at the heater end i dont think he will need a cimper and contacts. Just cut that off his original and splice it into the replacement like you plan to.

Posted : 24/08/2018 9:13 pm
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