yellowshark 153
40 minutes ago, SandervG said:
10 hours ago, yellowshark said:When I say measured I did this by manually extruding 10mm of filament and cutting it off and measuring the diameter.
Do you mean you extruded the filament not printing on a bed, but just catching it from the air? Wouldn't it stretch because it is still soft / warm and it just hangs there?
Hi @SandervG, that is a fair point. What I do first is to extrude 30-40mm to ensure all is extruding well and as it should be, which does mean that on the first cut it is not totally hanging as it is laying on the bed before the cut is made. BUT that does not apply to the subsequent cuts (although as I said above the measurements were cconsistent). I do not think that measuring it printed on the bed is reliable as that will depend on how squished you have the filament set to via the bed to nozzle distance. Visually it looks right, i.e. once the first tens of mm have been extruded the width of the extruding filament, from the nozzle tip to the bottom looks consistent BUT that is not the same as using a vernier! I guess the good thing for me is that this "stretched" filament was fatter than the specified nozzle diameter and using .45 was better than using .40. Your point though does make me think that I will have another play and maybe try 0.47 or even 0.5 and see what happens.??
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ghostkeeper
Almost. Cura calculates the total extrusion for the entire line. The print speed is irrelevant then. Correct! I don't know what Repetier does with it. They work with CuraEn
ghostkeeper
Indeed Cura doesn't have any such modelling. And neither does the firmware. All things in Cura related to this, such as coasting, involve compensating measures to counteract the effects of the pressur
yellowshark
Thanks for that @ghostkeeper, again really useful information.
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SandervG 1,521
That sounds good! What is it used for mostly, if you don't mind me asking?
Do you mean you extruded the filament not printing on a bed, but just catching it from the air? Wouldn't it stretch because it is still soft / warm and it just hangs there?
We do! I don't think we calibrate stepper motors, as they should all be good and consistent. But we do check them, and if they don't pass our calibration test and quality assurance, it is not going out until it does.
@ghostkeeper, can you say a little bit more about the post processing script; post stretch script? I can imagine there also lies a partial solution here re the ID of holes. Do we know of a speed / temperature / layer height which is ideal for an accurate ID? I could imagine, a small layer height, at a low temperature and not very fast so the amount of filament you extrude is small and therefor cools fast and is minimally stretched along the nozzle tool path? @Jakeddesign , did you try this script as well? (it can be found under extensions > post processing > modify g-code.
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