Change "maximum_value_warning" via variants file

[schpongo 1]

Hey, 

 

I have a printer with one extruder and two different hotends. One of them is an all metal hotend which supports temperatures of up top 300°C. The second hotend is a PTFE lined one which only supports temperatures of up to 245°C. In my printer definition file I've set:

"default_material_print_temperature": {
	"minimum_value_warning": "0",
	"maximum_value_warning": "230",
	"maximum_value": "235",
	"minimum_value": "0"
}

Now I would like the variants file for the all metal hotend to change the warning and min/max values. But since the variants file has a different format I'm not sure how to do that. I've tried:

[values]
machine_nozzle_size = 0.4
material_print_temperature_maximum_value = 300 

but this didn't work. 
How would I go about achieving this?

Greetings 
Daniel

[ahoeben 1,986]

You cannot do that via a variant file. The cfg files can only have values; for the definition of a setting, you need to use the .def.json. You could use a Python expression in your printer or extruder definition like this:

"default_material_print_temperature": {
	"minimum_value_warning": "0",
	"maximum_value_warning": "230",
	"maximum_value": "300 if machine_nozzle_size == 0.4 else 235",
	"minimum_value": "0"
}

Ofcourse you'll most likely want to use something else than the machine_nozzle_size to detect this particular variant.

[schpongo 1]

On 3/4/2020 at 3:05 PM, ahoeben said:

You cannot do that via a variant file. The cfg files can only have values; for the definition of a setting, you need to use the .def.json. You could use a Python expression in your printer or extruder definition like this:

"default_material_print_temperature": {
	"minimum_value_warning": "0",
	"maximum_value_warning": "230",
	"maximum_value": "300 if machine_nozzle_size == 0.4 else 235",
	"minimum_value": "0"
}

Ofcourse you'll most likely want to use something else than the machine_nozzle_size to detect this particular variant.

 

Thanks for the answer. 
I like the approach, but I would need to be able to get the current variant name in the definition file. 
I'm not sure how much python code I can actually use but I'm thinking of something like this:
 

"material_print_temperature": {
	"minimum_value": "0",
	"minimum_value_warning": "0",
	"maximum_value_warning": "230 variant_name.find('PTFE') > 0 else 300",
	"maximum_value": "235 if variant_name.find('PTFE') > 0 else 300" 
},

But this doesn't work, I guess because the variable "variant_name" doesn't exit. 

Does anyone have any input on this?

Greetings
Daniel

[ahoeben 1,986]

The variant name is not injected in the variables that you can use. In addition to that, the "maximum_value_warning" in your snippet is missing an "if".

 

I have given this some thought. What you could do (but it is not officially supported, so it might break in some future version of Cura) is define a new value in your machine definition:

 

"_material_print_temperature_maximum_value": {
	"label": "Maximum Printing Temperature",
	"description": "This is a private setting, please ignore",
	"type": "float",
	"default_value": 230,
	"enabled": false,
	"settable_per_extruder": true
},
"material_print_temperature": {
	"minimum_value": "0",
	"maximum_value_warning": "_material_print_temperature_maximum_value - 5",
	"maximum_value": "_material_print_temperature_maximum_value" 
},

This adds a new, "private" setting to your machine type only, which can not be made visible in the settings panel.

Then in your PTFE variant, you can just define a value for that setting (the other variants will use the default specified 230):

[values]
_material_print_temperature_maximum_value = 300

 

Edited March 10, 2020 by ahoeben

[schpongo 1]

Hey thanks for the answer! I'm sorry that it took me so long to reply. 

I tried what you suggested but didn't have any luck. It seems like I can't define new values in cura. Did you try you code?
 

[ahoeben 1,986]

I tried my code, but only with a different printer definition (the Ultimaker Original) because I don't have a complete definition for the FunMat printer.

[schpongo 1]

On 3/27/2020 at 7:23 PM, ahoeben said:

I tried my code, but only with a different printer definition (the Ultimaker Original) because I don't have a complete definition for the FunMat printer.

 

I've spent some more time trying to accomplish this, but so far I've been unsuccessful. I used your example and copy pasted it into the "overrides":{...} section of my definition. I did not add anything to my variants file because I wanted to check if this worked before. But what you suggested simply does not work for me. The "Printing temperature" is always marked red (see image). So I tried adjusting you code. I add and removed the following fields:
- "unit": "°C",
- "type": "float",
- "value": 210,
- "enabled": true,
- "settable_per_extruder": true,
- "settable_per_mesh": false,

I also tried moving the definition of "_material_print_temperature_maximum_value" to the "metadata": {...} section or creating my own section before or in "overrides": {...} named "own_values": {...}  which then contained the definition of "_material_print_temperature_maximum_value". But this all didn't work. I also tried using "_material_print_temperature_maximum_value" in other places (e.g. "material_print_temperature_layer_0") as the actual value and not just to calculate the warning. This lead to the values turning to zero (disabled?). Last I copied your code into the definition file from the original Ultimaker: 
 

"overrides": {
	"_material_print_temperature_maximum_value": {
	"label": "Maximum Printing Temperature",
	"description": "This is a private setting, please ignore",
	"type": "float",
	"default_value": 222,
	"enabled": false,
	"settable_per_extruder": true
	},
"material_print_temperature": {
	"minimum_value": "0",
	"maximum_value_warning": "_material_print_temperature_maximum_value - 5",
	"maximum_value": "_material_print_temperature_maximum_value" 
},

But this also leads to the "Printing Temperature" being marked red (see image). 

To me it seems my definition of the new value is not working as I also can't use it as a value for other predefined definitions.
 

[ahoeben 1,986]

Sorry, the definition for the private "_material_print_temperature_maximum_value" setting must be in a "settings" section, like so:

"settings": {
	"material": {
		"children": {
			"_material_print_temperature_maximum_value": {
				"label": "Maximum Printing Temperature",
				"description": "This is a private setting, please ignore",
				"type": "float",
				"default_value": 230,
				"enabled": false,
				"settable_per_extruder": true
			}
		}
	}
},
"overrides": {
	"material_print_temperature": {
		"minimum_value": "0",
		"maximum_value_warning": "_material_print_temperature_maximum_value - 5",
		"maximum_value": "_material_print_temperature_maximum_value" 
	},
	...
}

 

[schpongo 1]

Thanks, that works like a charm!!!