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Posted
· Estimated Print Time Relationship To Print Weight
Time estimates - The original author of Cura 15.X, for a while, had trouble predicting how long a print would take until he finally included the jerk and acceleration values of the printer. At that moment the predictions got impressively accurate. To this day I think cura still uses Ultimaker values of 5000 mm/sec/sec for the acceleration and 20mm/sec for the "jerk" (it's not truly jerk but that is what Marlin calls that setting).
Probably they updated Cura to know the actual default settings for Ultimaker printers but probably never did that for other printers like your ONI.
Those values might be somewhere in the settings of your printer profile which is probably in some .json file for the ONI. Or they might be in a default json file that the ONI inherits but doesn't modify?
You might be able to enable jerk and accel settings and just set them to the actual values of your particular printer. Such that they wouldn't modify the ONI but that might be enough to get Cura to make accurate time estimates.
Posted
· Estimated Print Time Relationship To Print Weight
grams - Well the gcode specifies exactly how far to move the extruder. In millimeters. So cura knows how much filament is supposed to go through the extruder (if you are underextruding it will be less - for example if you are printing a bit too fast for your printer).
Then Cura uses the known density for PLA to calculate the weight. It should be pretty close to the weight of your part.
Actually checking the weight of your part is a good way to measure underextrusion. 10% low is typically fine. 20% low is pretty crappy. I've seen parts that were 50% underextruded - they kind of have holes all the way through them.
Posted
· Estimated Print Time Relationship To Print Weight
18 minutes ago, gr5 said:
grams - Well the gcode specifies exactly how far to move the extruder. In millimeters. So cura knows how much filament is supposed to go through the extruder (if you are underextruding it will be less - for example if you are printing a bit too fast for your printer).
Then Cura uses the known density for PLA to calculate the weight. It should be pretty close to the weight of your part.
Actually checking the weight of your part is a good way to measure underextrusion. 10% low is typically fine. 20% low is pretty crappy. I've seen parts that were 50% underextruded - they kind of have holes all the way through them.
Okay thanks. the extra long time estimate doesn't bother me too much. Since I record estimated time and real print time I have decent idea what to expect. Plus I have a remote webcam setup on the printer bed so I can keep an eye on the progress of any print and anticipate when it's going to end.
The actual weight being printed and what will be left on a reel is what I really want/need to keep track of. Maybe it's just time to buy a gram scale so I'll have a truly accurate account of what's on a reel.
Thanks!!!
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gr5 2,224
Time estimates - The original author of Cura 15.X, for a while, had trouble predicting how long a print would take until he finally included the jerk and acceleration values of the printer. At that moment the predictions got impressively accurate. To this day I think cura still uses Ultimaker values of 5000 mm/sec/sec for the acceleration and 20mm/sec for the "jerk" (it's not truly jerk but that is what Marlin calls that setting).
Probably they updated Cura to know the actual default settings for Ultimaker printers but probably never did that for other printers like your ONI.
Those values might be somewhere in the settings of your printer profile which is probably in some .json file for the ONI. Or they might be in a default json file that the ONI inherits but doesn't modify?
You might be able to enable jerk and accel settings and just set them to the actual values of your particular printer. Such that they wouldn't modify the ONI but that might be enough to get Cura to make accurate time estimates.
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gr5 2,224
grams - Well the gcode specifies exactly how far to move the extruder. In millimeters. So cura knows how much filament is supposed to go through the extruder (if you are underextruding it will be less - for example if you are printing a bit too fast for your printer).
Then Cura uses the known density for PLA to calculate the weight. It should be pretty close to the weight of your part.
Actually checking the weight of your part is a good way to measure underextrusion. 10% low is typically fine. 20% low is pretty crappy. I've seen parts that were 50% underextruded - they kind of have holes all the way through them.
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KimLindaberry 0
Okay thanks. the extra long time estimate doesn't bother me too much. Since I record estimated time and real print time I have decent idea what to expect. Plus I have a remote webcam setup on the printer bed so I can keep an eye on the progress of any print and anticipate when it's going to end.
The actual weight being printed and what will be left on a reel is what I really want/need to keep track of. Maybe it's just time to buy a gram scale so I'll have a truly accurate account of what's on a reel.
Thanks!!!
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