Assuming that you have both coils connected correctly, then the only thing that can go wrong is that the motor has insufficient torque for the step rate (including acceleration). You can either increase the current or reduce the step rate.by bobc - Stepper Motors, Servo Motors, DC Motors
QuoteLeafy1 I had been considering a real smoothieboard, but got sucked into this thread with the MKS promise and now I'm questioning if I even want to go to ANY board that uses smoothieware firmware after seeing the attitude of the devs. The only potential show stopper I have past being worried about being bullied by the dev is can end stop switches be disabled after homing? I use a 1/4" MIC-6 aby bobc - Controllers
I had a another look on ebay, and I found some interesting cheap motors like this one Is that the sort of thing we need? I am not quite sure how to read the specs. I will get a few just to have a play with. I have some applications where this might be really useful.by bobc - General
I would recommend using 998: #define TEMP_SENSOR_0 998 // Extruder #define TEMP_SENSOR_1 0 #define TEMP_SENSOR_2 0 #define TEMP_SENSOR_BED 998 // Hot Bed which always give 25 deg.by bobc - Firmware - mainstream and related support
That's the v1.2 without fixes, mine has two watch crystal oscillators soldered on to replace ceramic resonators. I got mine from the official Aliexpress store.by bobc - Controllers
I like the idea, but it's hard to find motors from old inkjet printers if you don't have them. Finding a cheap enough motor and encoder with the right specs was always the sticking point for me.by bobc - General
I believe it is normal practice to connect PE (protective earth), chassis and 0V. Safety standards demand that exposed metal parts are connected to PE. So usually, 0V is connected to ground. - But... I've seen one case here where a cheap DC PSU had it's 12V output connected to earth. On it's own that doesn't matter, if you are driving a string of LEDs. But obviously if you connect that unit to aby bobc - Reprappers
I guess that the design of DuetNG is fairly well advanced, and it might be a bit late for feature requests. It would be nice to make Duet a bit more "Arduino friendly", i.e. allow a seamless programming experience from the Arduino IDE. I have added files to CoreDuet so a Duet can be added to Arduino IDE via Boards Manager. To program a Duet, I need to do Erase+reset before download, then usuallyby bobc - Duet
If anyone wants a "no solder" solution for ATX, there are plenty of ATX breakouts around, on ebay or seeedstudio for example. BTW, there are wiki pages on PSUs . ETA: those breakouts are useless.. 1.25A is hardly "beefy".by bobc - General
You can use ATX usually without problem. Sometimes you need a small load to get them to start. The main thing is to spread the load between enough conductors, each wire is rated for around 6 Amps.by bobc - General
If you are not familiar with the Arduino environment, then there is no easier way.by bobc - Firmware - Marlin
QuoteLoboCNC Quotebobc The Mod-T printer uses DC motors with encoders, this was mentioned in the ServoLolu thread, but I don't know what electronics is used. The MOD-t uses conventional DC motors and encoders rather than closed-loop steppers, and it uses a proprietary controller board and firmware. In the Servolulu thread, I replaced the MOD-t controller board with a Teensylu board and 4 of myby bobc - General
Quotevreihen Except for sharing the source, doesn't the Repetier web config system qualify for doing all of this????? IOW "Except for not meeting the requirements, does it meet the requirements?" No [ I've noticed people do this a lot, but essentially you can make any statement true by prefixing with IF <thing you want>. "Except for" and "apart from" are similar conditionals.] Anyway,by bobc - Bounties
Not sure there is anything radically new there, but a nice build for your $30K. They have basically taken a frame designed for traditional machining and adapted for 3DP. That gives a quick to implement and known design, but may not be ideally suited to 3DP. They don't seem to mention much about the extruders, which are pretty critical. I was also interested by the print bed - a large unenclosedby bobc - Reprappers
The Mod-T printer uses DC motors with encoders, this was mentioned in the ServoLolu thread, but I don't know what electronics is used.by bobc - General
Are you trying to save the cost of the Arduino? Modern PCs are really cheap and fast, but lousy for hooking up stuff cheaply, since DOS and the parallel port went away. But if you use BeagleBoneBlack with CRAMPS and LinuxCNC it's pretty much what you are looking for.by bobc - Reprappers
Are you using one of those cheap open frame PSUs? If so it is probably wrongly wired. I would try a different PSU.by bobc - Reprappers
Quotedc42 Bob, CoreDuet has been replaced by CoreNG in my latest release. This is based on a more recent version of the Atmel Software Framework than the Arduino Due core was, which I need in order to support the forthcoming new Duet board as well as the existing ones. No problem, I had to start somewhere, I thought that CoreDuet might be most stable. I plan to pick up CoreNG in future. The chaby bobc - Duet
Looks good! About the statement "Basing the design on Arduino allow the use of existing tools and libraries."... The Duet has hardware differences so you can't use the standard Arduino Due support, and the only firmware available is built with Eclipse. The RepRapFirmware uses a package called CoreDuet tailored for the Duet hardware. I'm currently working on modifying CoreDuet to work in the Arby bobc - Duet
New directions... After a review of the "state of the art" and a rethink, I've decided that it is not worthwhile to reinvigorate RAMPS-FD. There are many other 32 bit options now, and RADDS is a very good alternative to RAMPS-FD. The Smoothie ecosystem now seems to be a well accepted alternative to AVR based solutions as well. The BeagleBoneBlack plus printer cape is a very capable system, andby bobc - Controllers
If your printer turns off, it sounds like you have the endstop switch wired across 0V and +5V. That is bad! You want either: Signal (marked S) and 0V, OR S and +5V (marked +). You might find this usefulby bobc - RAMPS Electronics
I had a look at servo specs before, to see if the control signal is 3.3V compatible. The answer is it depends on the servo. e.g. this one indicates 5V but this one says 3.3V to 5V The servo must still be powered at 5V (or whatever normal supply voltage) of course. So either find a servo with a known spec, or trial and error. Sparkfun sell a little level translator which should workby bobc - Controllers
My first guess is it's a config problem. My second guess is that Geeetech boards are known to be often faulty. If you have a multimeter, check there is a connection between the Due pins and the stepper header. Also make sure you have the ESTOP jumper fitted.by bobc - Reprappers
The fact is, the successful Open Source projects rely on commercial sponsorship. (see ) Perhaps the investment company behind Octoprint have decided to change priorities, or that they had hoped to monetize Octoprint which didn't work out. Ironically they seem to be getting more publicity now than when they were sponsors. Or maybe it was pure social goodwill on their part. But the good thing isby bobc - General
Unfortunately Chinese companies routinely ignore license requirements. If you are lucky you might get a scrappy drawing in a PDF, I don't think I've ever seen any of them publish source files. I guess it might be different if you could read/speak Chinese and access their websites.by bobc - General
I am using old Compaq server PSUs, they have a decent 32amps at 12V output, as well as 5A at 5V (I bought at £10 each including shipping). But you can also get 12V to 5V converters for a couple of quid from ebay, they will do 2A or more. I appreciate it is always more convenient to have everything on board, but where do you draw the line? Someone will always want more - to run LED strings, RasPiby bobc - Duet
It's not the voltage, it's the current. Even a small servo can draw up to 1 Amp, the 5V regulator is only rated for 1Amp, and that also feeds the 3.3V. Even active endstops only use a few milliamps, so there is no problem powering from the onboard 5V.by bobc - Controllers
Hmm, great idea! Use 3 Z motors and get software controlled bed levelling. 3 motors on one axis might be pushing your luck. Of course, depends on the load.by bobc - General
I wonder how many people actually run dual power supplies? I guess you need physically two, I've never seen a 12/24V unit. RAMPS-FD has 3 power inputs, that seems unnecessary and inconvenient for the majority of users. I get that some people will want to tinker or run custom setups with multiple power rails, but there are several ways to achieve that without having it directly on the main controlby bobc - Duet
LOL, what has RepRap come to. Salesmen for various boards plugging their own products and spreading FUD about competitors. What a shame.by bobc - General