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It's the minimal layer time, which is currently 10 seconds, combined with the minimal feedrate. Both still need some tweaking for the correct settings for these kinds of prints.

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It's the minimal layer time, which is currently 10 seconds, combined with the minimal feedrate. Both still need some tweaking for the correct settings for these kinds of prints.

Thank you for answer Daid,

I will test different tweaking, there is a problem if i lower the value to 1 second ?

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If you have good retraction you can try printing all the same sized gear parts as 1 plate, you can print many small parts faster that way as you don't hit the layer time minimum. And as the nozzle spends less time per part you solve this melted blob problem too. But if you don't have a well tuned machine with good retraction settings then you'll get strings. I think it's easier to fix those than this blob, though...

Beware though the current version of Cura project planner has a bug and will crash your machine if you print 'layer at a time' instead of 'object at a time' or what's it called... You can just export a combined STL and slice it normally, or edit the gcode -- look for a Z0 move near the end and remove it.

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If you have good retraction you can try printing all the same sized gear parts as 1 plate, you can print many small parts faster that way as you don't hit the layer time minimum. And as the nozzle spends less time per part you solve this melted blob problem too. But if you don't have a well tuned machine with good retraction settings then you'll get strings. I think it's easier to fix those than this blob, though...

Beware though the current version of Cura project planner has a bug and will crash your machine if you print 'layer at a time' instead of 'object at a time' or what's it called... You can just export a combined STL and slice it normally, or edit the gcode -- look for a Z0 move near the end and remove it.

Thank you, i'll try that.

I tested a print with a mimimal layer time set to 0 and the result is better but not perfect :

20121027100316.jpg

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I've found that using the dwindle setting on something like this helps too. It slows the print down quite a bit as the layer size gets smaller. It would give the fan more time to cool the layers. I suppose it is similar to the minimum layer time too, but works well for me. I also have the fan set lower than 100% and I'm using a range, so as the printing slows, the fan picks-up faster.

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I've found that using the dwindle setting on something like this helps too. It slows the print down quite a bit as the layer size gets smaller. It would give the fan more time to cool the layers. I suppose it is similar to the minimum layer time too, but works well for me. I also have the fan set lower than 100% and I'm using a range, so as the printing slows, the fan picks-up faster.

Thx mrjohnk, i'll try that too.

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