A new Dual Pinch extruder is now available, the DyzeXtruder GT What do you think? August 16, 2016 02:50PM |
Registered: 7 years ago Posts: 44 |
Re: A new Dual Pinch extruder is now available, the DyzeXtruder GT What do you think? August 16, 2016 03:24PM |
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Re: A new Dual Pinch extruder is now available, the DyzeXtruder GT What do you think? August 17, 2016 03:29AM |
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Re: A new Dual Pinch extruder is now available, the DyzeXtruder GT What do you think? August 17, 2016 07:27AM |
Registered: 10 years ago Posts: 14,672 |
Re: A new Dual Pinch extruder is now available, the DyzeXtruder GT What do you think? August 17, 2016 07:56AM |
Registered: 11 years ago Posts: 5,780 |
Re: A new Dual Pinch extruder is now available, the DyzeXtruder GT What do you think? August 17, 2016 06:55PM |
Registered: 7 years ago Posts: 44 |
The DyzeXtruder has many great features and is designed for a maximum reliability. The Titan does a great job for a great price, but some customer require a more professional option. The price is well chosen for both products.Quote
PDBeal
For it being twice the price of the E3D Titan extruder with a higher gear ratio, what makes it better (if it is better)?
The extruder is able to push filament above 30mm/s while keeping the specified torque. This is equivalent to 72 mm^3/s with a 1.75mm filament and it is more than the Volcano can handle.Quote
PDBeal
How does the high gear ratio deal with the requirements of say the E3D volcano hot end?
The inside are machined from aluminum block and there is no way for the filament to escape.Quote
PDBeal
It would also be nice to see what it looks like behind the cover where you have the dual pinch setup to see that there is no possible way a flexible filament could get stuck or hung up or pushed out the wrong way.
Mount it easily with the side hole. Screws are supplied with the extruder.Quote
PDBeal
What kind of mounting brackets are required or does it use? Are they extra or included?
The hobbed gear/pulley is made from a blend of straight deep knurling and lathe operations. It minimize filament deformation and provide a clean operation without filament stuck between the gears.Quote
jinx
it's a lot of cash, though it looks well made and constructed of some hardy materials, but it not really needed for the likes of pla giving the price of the exotic filament " cant see a huge following of carbon printing, cant recall seeing an image of the pinch wheels or a glimpse of the hobbed gear/pulley. but what stands out for a $140 extruder is the use of a $2 push fit.
not once in those three video is there a demonstration on loading filament??.
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dc42
A problem I have experienced before is that if the motor current is set too high, the force produced is to great that if the nozzle becomes temporarily obstructed (e.g. due to the nozzle being too close to the bed, or curl-up on an overhang), the hobbed shaft grinds the filament up, losing grip on the filament until there is manual intervention. With lower force, the motor will skip steps while the nozzle is obstructed and extrusion restarts when the obstruction is removed. However, if the gearing is high and the motor rotor inertia is high, then reducing the current to avoid excessive force may make it impossible to accelerate the motor fast enough to get a good retraction speed.
Therefore I am suspicious of highly-geared extruders used with high-inertia motors. Unfortunately, on the web site I can't find any of the information I need in order to evaluate whether this is likely to be a problem. Specifically I want:
- Detailed specifications of the stepper motor
- Nature of the pinch mechanism (hobbed shafts, rubber rollers, or something else?
- Radius of the pinch wheels or hobbed shafts
- Approximate microsteps/mm, for a given motor steps/rev and microstepping factor
I'm glad that you like the mounting! It is very easy to maintain the printer with only two screws to loosen.Quote
the_digital_dentist
It looks pretty good, and I like the mounting holes on the side of the extruder. It would be nice to see the guts.
I run a Bulldog XL with a 5:1 gearbox and have had only 1 filament jam in two years- caused by a foreign object. I keep the pinch wheel tension high so the drive gear bites deeply into the filament. It has never chewed a divot into the filament. I have attempted to print with the nozzle set too close to the bed a few times and caused the motor to slip. Recovery is instantaneous. I typically print at 40-50 mm/sec. After hours of operation the motor only gets warm.
Re: A new Dual Pinch extruder is now available, the DyzeXtruder GT What do you think? August 18, 2016 05:34AM |
Registered: 10 years ago Posts: 14,672 |
Quote
Dyze_Design
Quote
dc42
A problem I have experienced before is that if the motor current is set too high, the force produced is to great that if the nozzle becomes temporarily obstructed (e.g. due to the nozzle being too close to the bed, or curl-up on an overhang), the hobbed shaft grinds the filament up, losing grip on the filament until there is manual intervention. With lower force, the motor will skip steps while the nozzle is obstructed and extrusion restarts when the obstruction is removed. However, if the gearing is high and the motor rotor inertia is high, then reducing the current to avoid excessive force may make it impossible to accelerate the motor fast enough to get a good retraction speed.
Therefore I am suspicious of highly-geared extruders used with high-inertia motors. Unfortunately, on the web site I can't find any of the information I need in order to evaluate whether this is likely to be a problem. Specifically I want:
- Detailed specifications of the stepper motor
- Nature of the pinch mechanism (hobbed shafts, rubber rollers, or something else?
- Radius of the pinch wheels or hobbed shafts
- Approximate microsteps/mm, for a given motor steps/rev and microstepping factor
Good point. The 26mm motor is very small, light and has low inertia. Our current set-up operate with the basic 3000 mm/s^2 and there is no problem! The grip force and filament tension are designed to get this clicking "feature" before grinding, as we had with the previous extruder.
The motor runs at 1A, rated at 4.3V, 5mH inductance, 34 g.cm^2 inertia. It is probably one of the smallest motor available in NEMA17 size.
The pinch mechanism are made of straight knurling and lathe operations.
The pitch diameter is about 9.6mm
The extruder is configured at 645 steps / mm at 16µstepping
Re: A new Dual Pinch extruder is now available, the DyzeXtruder GT What do you think? August 18, 2016 12:59PM |
Registered: 7 years ago Posts: 44 |
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dc42
Thanks. You didn't give the holding torque of the motor at its rated current, but from looking at other motors of similar size I estimate it is about 18Ncm. Assuming it is a standard 1.8deg/step motor, this gives a product of steps/mm and torque of 11610, which is in the middle of my recommended range of 8000 to 14000. So IMO the gear ratio is about right for the design.