Differences between types of extruders
Hi everyone! I'm building a new printer, and now I'm choosing the extruder to mount. I know that there are three types of extruders: - Geared extruder - Bowden extruder - Direct drive Anyone knows...
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hi, I also have the same questions, someone with more experience could explain better? Within the direct drive type which is the best model designed so far? Thanks neo
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In my opinion the best is hands down a bowden extruder. The acceleration of the machine has a direct effect on the surface finish and higher acceleration gives a smoother surface. But I see no reason...
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What about retraction problems introduced with the long bowden cable? And the mass of the motor reduces so much the maximum speed and acceleration?
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I think it is the mass and the springiness of the motor acting as a magnetic spring causing the issue of resonance. The retraction issue is not a much of problem with some hotends as it is with...
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I cannot understand very much this resonance issue you are talking about... I thought that the problem of the mass of the extruder was linked to the power of the motor of the X axis (considering a...
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When you try and change direction all that mass keeps trying to move in the original direction. This cause the axis to go past the actual location you want to be at and because the motor acts like a...
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Oh ok, you are talking about the problems caused by the inertia of the moving mass, sure, what I meant too! I don't really want to change the extruder I'm using, I was only thinking for a new printer :D
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Sublime Wrote: ------------------------------------------------------- > The retraction issue is not a > much of problem with some hotends as it is with > others. What I found was we want a...
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I did not say all others were lower back pressure, just that a real j-head has high back pressure. If you look at the measurements [jheadnozzle.blogspot.ca] of the length of the exit hole on a real...
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That's interesting, I thought the J-Head had particularly low back pressure, since it's lower than the others I have used (Arcol V4 and my late Mendelparts V9). The Arcol must have a really long...
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The feed resistance has two components. One is imposed by the nozzle. If this is high, but you can still extrude consistently, then that is a good thing. The other component is the resistance to...
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I can't found anywhere a quantitative answer to my problem: how much does the weight of the motor really affects on the print speed and movement?
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Re: Differences between types of extruders
This is the difference of the light weight carriage on Tantillus vs my Prusa.
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Thanks very much! The weight of an extruder motor (nema 17) is approximately 0.35 kg. I will have the same problems with a light weight motor like this one that weights only 185 g?
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That would make the X axis nice and light but you will still end up with some resonance from the bed weighing a lot.
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Now I'm thinking to build a coreXY printer. So the bed is fixed and the extruder moves in the xy plane. I prefer to have a better control on extrusion and retraction, and that's why I'm trying to...
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What are the pros and cons of CoreXY versus the Ulitmaker / Tantillus crossed bars scheme?
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Personally I don't like very much the Ultimaker design because it has too many pulleys (CoreXY uses many pulleys too, but you can change them with bearings, I think) and belts (also two small...
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Don't forget about Delta geometry it is quickly gaining popularity and the ones that work well work really well. Also do note the issues my picture shows is extreme. My Prusa was a year old at the...
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