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morgan_ebc

Ultimaker 2 mm/s discussion

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does anyone know how to convert the mm/s speeds to the percentages on the read out on the machine?

the ultimaker 2 software shows that you are able to go from 0.02mm/s to 300mm/s speed. but when you go to the actual machine it shows it from 0-1000% not in mm/s.

i was wondering if anyone knew how to convert it to percentage. i've looked around the internet and also here but couldn't find anything

 

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It's cura, not "Cuba" :D Sorry, it's Friday and late, and I'm tired, that made me giggle :p

No, if you bump it to 300% with a setting of 300mm/s in cura, the printer would try (and fail) to print at 900mm/s. You can't really print at any of those speeds though.

Normally there wouldn't be any reason to change this setting. It can be used if you notice that what you're printing is having trouble at the speed you selected. You can then simply lower the speed a bit and let it continue instead of aborting a starting a new print. Or if you're in a hurry for a print to finish you could bump the speed up a bit.

 

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The "feedrate %" affects all 4 axes equally X,Y,Z,E but realize that each axis also has a max velocity. So if Cura requests a move at 300mm/sec and you choose 200% feedrate then it will print at the XY max speed which I believe is still 300mm/sec. The problem with going faster is the Uno chip can't go much faster than that. I'm quite sure the hardware can go faster.

I usually print at 100% because after 2 years I am more patient and just let it print at 35mm/sec. Plus I have 2 printers. But there was a time when I *always* printed at 100mm/sec and that way I could mess with feedrate and the % equaled the mm/sec. Nice trick, eh?

 

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Also note that messing with feedrate will override the "minimal layer time". Say your minimal layer time is 10 seconds and you are on a small layer or printing a very small part that normally only takes 5 seconds. Cura will tell the printer to print at half the normal speed to spread that 5 seconds out to 10 seconds so that the layer has time to cool before the next layer.

But if you set feedrate to 200% then it will only print that layer in 5 seconds and you have defeated the feature.

 

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Right. Cura puts a feedrate into the gcode file that satisfies the "minimum layer time" condition.

Then when you tell the printer to print at a faster speed, Marlin doesn't know anything about minimum layer time. It just knows the requested speed in gcode and multiplies by the feed rate %.

 

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