Thinner Filament. September 19, 2018 10:02PM |
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Re: Thinner Filament. September 20, 2018 12:16AM |
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Re: Thinner Filament. September 20, 2018 02:45AM |
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Re: Thinner Filament. September 20, 2018 03:36AM |
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Re: Thinner Filament. September 20, 2018 12:02PM |
Registered: 5 years ago Posts: 13 |
Re: Thinner Filament. September 20, 2018 12:10PM |
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Re: Thinner Filament. September 20, 2018 03:12PM |
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Re: Thinner Filament. September 21, 2018 12:11AM |
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Quote
MKSA
The motor power required is mainly a function of the extrusion flow. If you reduce the filament diam., you will have to run at a higher speed to keep the same flow !
Re: Thinner Filament. September 21, 2018 12:15AM |
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Re: Thinner Filament. September 21, 2018 12:55AM |
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Quote
o_lampe
Quote
uticatechclub
Could it be also true, that reducing existing drive gear by the same ratio achieved by reducing 1.75 mm filament to 0.8 mm filament would be good enough? Am I over simplifying?
I don't understand what do you mean with reducing the gear?
Re: Thinner Filament. September 21, 2018 01:40AM |
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Re: Thinner Filament. September 21, 2018 03:10AM |
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Quote
o_lampe
Quote
MKSA
The motor power required is mainly a function of the extrusion flow. If you reduce the filament diam., you will have to run at a higher speed to keep the same flow !
I'm not good at math, but I doubt that.
I agree that melting power is proportional to extrusion flow, but from my experiments I've learned that the filament diameter has a significant impact on required motor power.
The torque of a current controlled e-motor is always max at low RPM and stays constant upto 50% of it's max. RPM.
Max RPM is proportional to V_motor. At 24V this means it can run faster than usually required for a extruder. E3D Titan is a good example.
You are right, that it has to run faster, but I say: it doesn't matter.
Re: Thinner Filament. September 21, 2018 04:47AM |
Registered: 8 years ago Posts: 5,232 |
Quote
JoergS5
It would be interesting to produce thinner filament on-the-fly from 1.75 mm or 3 mm filament, i.e. remelt into thinner filament before it moves into the hotend. This remelt should be done protected from oxygen.
Re: Thinner Filament. September 21, 2018 04:31PM |
Registered: 8 years ago Posts: 318 |
Quote
o_lampe
Quote
JoergS5
It would be interesting to produce thinner filament on-the-fly from 1.75 mm or 3 mm filament, i.e. remelt into thinner filament before it moves into the hotend. This remelt should be done protected from oxygen.
That was partly my 1st. idea, but pushing still hot filament through a Bowden tube is a no_go.
Re: Thinner Filament. September 21, 2018 07:19PM |
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Re: Thinner Filament. September 22, 2018 02:01AM |
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Quote
uticatechclub
Quote
o_lampe
Quote
uticatechclub
Could it be also true, that reducing existing drive gear by the same ratio achieved by reducing 1.75 mm filament to 0.8 mm filament would be good enough? Am I over simplifying?
I don't understand what do you mean with reducing the gear?
I mean making it smaller proportional to how much smaller in diameter the new filament became.
Re: Thinner Filament. September 22, 2018 03:53AM |
Registered: 6 years ago Posts: 1,007 |
Quote
o_lampe
A finer pitch for the teeth would make sense, but reducing the diameter would cause more RPM for the same feed rate. Something like the Bondtech extruder would work. It would grip the filament from two sides.
Re: Thinner Filament. September 22, 2018 06:06PM |
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Re: Thinner Filament. September 23, 2018 01:58AM |
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Re: Thinner Filament. September 23, 2018 03:45AM |
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Quote
o_lampe
That's why I chose 0.8mm filament. It matches 1mm ID Teflon tube. I was lucky to get a tube with 2mm OD. It fits inside the normal PTFE-heatbrakes.
It also needs proper guidance between gear and heatbrake to avoid spaghetti.
IMHO the chamber pressure can be much lower, since the cross-section of 0.8mm filament is so much smaller than 1.75 or even 3mm.
I had no problem with 1st. layer adhesion, but I have LokBuild on my printbed. PLA almost sticks too good on it.
Re: Thinner Filament. September 23, 2018 04:45AM |
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Re: Thinner Filament. September 23, 2018 06:07AM |
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Quote
JoergS5
I am thinking about whether it's possible to press the melted filament into the nozzle with other measures than the extruder.
If melted material can be pressed by e.g. Argon to avoid oxygen reactions, you could make overpressure or underpressure to control the melted filament flow.
The reason I am thinking about this is to think about printing aluminium.
Re: Thinner Filament. September 23, 2018 02:02PM |
Registered: 5 years ago Posts: 155 |
Quote
MKSA
Done for metal using plasma, laser, ion beam deposition.
VDX mentioned his current work, laser plus "plastic" filament.
Re: Thinner Filament. September 23, 2018 02:05PM |
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Re: Thinner Filament. September 23, 2018 02:21PM |
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Quote
VDX
... not powder - think about melting/fusing thin wires with the laser
Re: Thinner Filament. September 23, 2018 02:31PM |
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Re: Thinner Filament. September 23, 2018 04:15PM |
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Re: Thinner Filament. September 23, 2018 04:36PM |
Registered: 5 years ago Posts: 155 |
Re: Thinner Filament. September 23, 2018 05:23PM |
Admin Registered: 16 years ago Posts: 13,890 |
Quote
JoergS5
Besides welding I found the possibility of galvanic 3d printing, but it's very slow.
Re: Thinner Filament. September 24, 2018 12:22AM |
Registered: 8 years ago Posts: 5,232 |
Here is my direct extruder. The filament path can't be much shorter. It's driven by a 1A/13Ncm NEMA17 pancake. ( forgot the exact weight )Quote
MKSA
Anyway, buckling becomes the real killer and one has to reduce the distance from hobbgear to melt zone. This is why I don't like the E3D kind of attachment, heatbreak and heatsink that became the standard and made my own far shorter.