The merits of a luxury motherboard. February 25, 2017 08:29AM |
Registered: 7 years ago Posts: 20 |
Re: The merits of a luxury motherboard. February 25, 2017 11:34AM |
Registered: 10 years ago Posts: 14,672 |
Re: The merits of a luxury motherboard. February 25, 2017 09:11PM |
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Re: The merits of a luxury motherboard. February 26, 2017 06:32AM |
Registered: 7 years ago Posts: 61 |
Re: The merits of a luxury motherboard. February 26, 2017 07:06AM |
Admin Registered: 13 years ago Posts: 6,995 |
Re: The merits of a luxury motherboard. February 26, 2017 07:24AM |
Registered: 10 years ago Posts: 14,672 |
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dart16
Voltage regulator on the arduino is not a problem if you are connected to either a powered hub or a computer as +5v also comes down the USB cable. (if there even is a problem - -AMS1117 is rated at 800mA)
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dart16
Pot twiddling is just as much fun as software tweaking.
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dart16
you can use 24v on an Arduino/RAMPS board
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dart16
10amps through the input connector is enough..if you need more make different arrangements (SSR or Relay directly fed from the PSU without connectors)
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dart16
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Web interface....no thanks..un-necessary complication
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dart16
Text file editing instead of re-compiling....nothing in it.. Once you have the calibration defaults set in firmware they are less likely to get modified accidentally and they can be tweaked to EEPROM
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dart16
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Delta bed calibration works fine as it is
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dart16
Better heat dissipation?...fit a fan and keep the motherboard cooler as well - and be able to swap out a blown stepper driver and not have to replace the whole board
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dart16
All the above is just my opinion please don't take offence. The Auruino/RAMPS is certainly getting old and newer boards will be needed to drive developments so if you feel you want to be part of that scene you will have to put your hand in your pocket.....
Re: The merits of a luxury motherboard. February 26, 2017 08:03AM |
Registered: 7 years ago Posts: 61 |
Re: The merits of a luxury motherboard. February 26, 2017 09:32AM |
Registered: 7 years ago Posts: 61 |
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dc42
I have seen many tens of posts on these forums by users with exactly this issue. The 800mA rating of the regulator is ok but it's the power dissipation that is the problem. I ran some tests and I found that the regulator temperature is OK even with 15V input if you don't have an LCD connected. Once you connect a graphical LCD, the regulator overheated even with 12V input. YMMV, it depends on how much current your LCD backlight draws.
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dc42
Maybe for you it is, but many user struggle with it, either because they don't know what voltage to set (the relationship between VREF and motor current depends on which drivers you have) or because they blow the drivers in the process. I think that most users of plug-in drivers have no idea what current their motors are running at. Software-controlled motor currents also allow you to reduce the current when performing operations such as homing and bed probing.
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dc42
Only if you are lucky enough to get one with 35V capacitors. Most RAMPS boards have 16V capacitors, which are likely explode quite dramatically if you apply 24V to the main power input (the bed power input is separate and is normally 24V-safe). And you will definitely have to provide a separate 5V supply.
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dc42
Tell that to all the users whose bed heaters don't get hot enough, but whose RAMPS boards get plenty hot. Yes 10A is enough for a typical 200x200mm PCB bed heater; but PCB bed heaters have very wide tolerances (probably due to variation in the copper thickness) and some need as much as 13A.
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dc42
Once you add an SSR you lose some of the cost advantage of RAMPS.
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dc42
Unless you have used a good web interface, IMO you're not qualified to say. DuetWebControl is a huge step up from Pronterface and the like. It's USB that is an unnecessary complication. USB ground loops - which are inevitable when you connect 12V-powered Arduino/RAMPS or similar to a PC - are a common cause of trouble, the most common being hangups and overheating USB cables. The only board I know of that doesn't suffer from USB ground loops is RAMBO, which uses an expensive digital isolator on the USB interface.
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dc42
Why do you think there are so many posts along the lines of "I changed configuration.h/downloaded new source code, now I can't compile Marlin"? btw you need to recompile Marlin even to make tower position corrections when calibrating a delta printer.
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dc42
If that is the case, why do so many users struggle to get their delta calibrated well enough to get a good first layer?
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dc42
Better not to blow the stepper drivers by overheating them or getting the pot-twiddling wrong in the first place. If you need higher motor current, a fan only gets you so far with plug-in drivers. Drivers properly heatsinked on a large PCB and a fan cooling the PCB gets you a lot further.
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dc42
No offence taken! Your opinions are bound to be shaped by your experience, and I guess you've had a better experience with Arduino/RAMPS than some. My opinion is was shaped by being introduced to the Duet on my first 3D printer, then using Arduino/RAMPS initially on my second one and finding it a huge retrograde step. I've also helped a few users get their Arduino/RAMPS printers working, and seen how much they struggle to get the motor currents right and their delta printers calibrated. But I still consider Arduino/RAMPS a reasonable option for those who are technically competent but on a tight budget.
Re: The merits of a luxury motherboard. February 26, 2017 10:30AM |
Registered: 10 years ago Posts: 14,672 |
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dart16
..but never seen a USB cable overheat.
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dart16
Because they do not understand what they are doing.
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dart16
Are you saying that those people you have helped that have struggled with an Arduino/RAMPS setup wouldn't have struggled with a duet as a first printer?
Re: The merits of a luxury motherboard. February 26, 2017 11:37AM |
Registered: 7 years ago Posts: 61 |