Why are heaters marked with the letter "E"?
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Why the heaters are indicated by the letter "E" in the "Cooling fans" interface? Indeed, in all other places in the interface and in the associated G-code commands, the heaters are designated by the letter "H"...
Is there any logical mnemonic for this?
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In the place where you see the E0 what is being specified is what is being heated, the bed or an extruder.
Of course there is a connection between what is being heated and what heater is used.
So it is confusing but the heater being monitor can be determined.
As to why it is done that way - I have no idea.
Frederick
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@fcwilt said in Why are heaters marked with the letter "E"?:
In the place where you see the E0 what is being specified is what is being heated, the bed or an extruder.
It is possible. But it doesn't have to be related to the extruder.
All heaters except BED are designated "E". Even if it is a chamber heater:
"BED", "E", "C"? ..
In my opinion, the use of the letter "E" for the heater is incomprehensible and brings certain inconveniences. -
I agree the current arrangement does seem somewhat odd.
I've never had a printer with a chamber heater.
Do they normally have an associated cooling fan?
Frederick
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@fcwilt said in Why are heaters marked with the letter "E"?:
Do they normally have an associated cooling fan?
I do not know. I have a printer without a thermal camera; I just gave an example that the heater is not always an extruder.
Thermal chamber fan - it is possible that it is necessary. Hot air rises, and the temperature must be equalized throughout the chamber, so I think the air will have to be mixed, especially in printers with a large working volume. I have seen printer designs with a heat chamber and a fan embedded in the top panel. -
@eagleb3 this is from the original design where a heater was either a bed heater or an extruder heater. In newer boards we just call them outputs.
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@t3p3tony , It's clear. Thanks!
It seems to me that the time has come to make a change. After all, this is just a designation (visualization) in the "Config Tool" interface. It's probably familiar to old controller users, but it can be confusing for newer ones. -
@eagleb3 Thanks for pointing that out, it's indeed a left-over caption from older Duet versions and RRFv2 naming. The updated version shows Hnn instead of Enn on the Fans page. Regarding the drive selection on the Tools page you could still argue they're Extruder drives and correspond to the items on the Motors page.
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@chrishamm does the config automatically present the combinations of previosuly defined tools and confgurable elements?
so if in the previous step, there is only 1 extruder and 1 hot end heater defined the list of possible choices is small.
what happens in the case of a mixing hotend, like a Cyclops? you would have E0 and E1, correct?
you would have 2 tools, both with heater H1 and fan P1 defined.
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@sinned6915 In case of a mixing tool you can have basically as many tools as you want and assign multiple extruders to a single tool with a single heater. AFAIR the configtool lets you set different mixing ratios as well. Of course that requires having more than one extruder, too.
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@chrishamm said in Why are heaters marked with the letter "E"?:
@sinned6915 In case of a mixing tool you can have basically as many tools as you want ...........................
Slight correction - a limit of 50 tools was imposed some time back in the firmware (but that should be plenty for anyone).
