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Printing issues ...
Re: PCB Heatbed not getting hot enough - 9 years ago
Quotebatchkrazy Has anyone tried adding a 3.3 or 10 ohm resistor to thier bed to drop its resistance. 3.3 would bring it down to around .8 and the 10 would drop it down around .9. this would help your bed heat up faster and get to higher temps. not sure what it would do to the rest of the system.It doesn't work that way. The circuit's total resistance might be what an ideal resistance would be,by cdru - General
Re: LJ12A3-4-Z-BX wiring - 9 years ago
I'd just start in the auto bed leveing section of the firmware (your firmware version/branch may have it at a different location) and just start filling in the parameters or going with default. You need to choose whether you're doing a auto grid leveling or 3 defined points. 3 points define a plane so if your bed is perfectly flat, but not level, that's the minimum best option. If your bed is nby cdru - RAMPS Electronics
Re: LJ12A3-4-Z-BX wiring - 9 years ago
For ANY NPN sensor resistors are not needed. A NPN resistor acts like a switch grounding the microcontroller's pin. It's already at a safe voltage since it's coming FROM the microcontroller. If it was a PNP sensor, the sensor would be sending whatever voltage it was operating at TO the microcontroller, so you'd have the possibility of sending more than 5V to the microcontroller, likely fryingby cdru - RAMPS Electronics
Re: using all 4 servo pins - 9 years ago
Slow down there turbo. I wasn't trying to office you. I was just trying to point out that it's a simple design and that if you're capable enough to send something off to OSH Park to be produced, just recreating the design won't be a problem and probably be faster. It's a really simple circuit. (Here's the schematic btw: I doubt you'll find actual Eagle files) Board dimensions won't be that muchby cdru - RAMPS Electronics
Re: Cable-driven restrained Z-motion - 9 years ago
Unless you tensioned the lines far more than they would support, I don't think you'd get anywhere near the stability you'd need. Any type of movement of the printer would cause oscillations of varying degree depending on the vertical position of the bed. You've taken something fairly simple with linear rods and made it extremely complex with positioning of 7 (or more) lines. What you'd save onby cdru - General
Re: using all 4 servo pins - 9 years ago
Just look at the pictures here - If you're able to send off a design to OSH Park you're capable of looking at the photo and recreating the traces. It's not a very complicated circuit board. The only thing you might not be able to make out is the MOSFET and that's a IRF8313PBF.by cdru - RAMPS Electronics
Re: AISI 304 steel smooth rods - 9 years ago
What type of bearings are you using? And what are the tolerances of the rods that you're using? I'd say that is just as important if not more important than just the hardness. And what country are you in? There's a global marketplace out there you know...by cdru - General
Re: using all 4 servo pins - 9 years ago
The RRD expansion board is a bad design if you want to use all 4 ports. Build your own extender or there are ready-made alternatives.by cdru - RAMPS Electronics
Re: LJ12A3-4-Z-BX wiring - 9 years ago
That is correct for the typical sensor wiring colors. No resistors are needed as your sensor is a NPN and you are sinking the voltage coming FROM the microcontroller, not sourcing it going TO the microcontroller. Instead of the 12V coming from the brown pin, you can try to use the 5V supplied with the pin beneath the blue pin making for tidier wiring. Some sensors will work with 5V even thoughby cdru - RAMPS Electronics
Re: Relay Board - 9 years ago
Now that you described the circuits they make a bit more sense. It's Rube Goldberg-ish though. Just put a switch on the 11A input and get rid of both of the top relays. The one on the left isn't doing anything anyways. Your switch is already switching the power...the same power that would be powering the "Always on" accessories. And that one switch would control both the always-on as well as whby cdru - RAMPS Electronics
Re: Choice Belt, wire line, guitar string? - 9 years ago
My thought is that I've never seen precision timing string even for very lightweight applications. I have seen precision timing belt. Both pulleys and 6mm wide 2mm pitch gt2 belts by the meter run < $2 if you look around. Cost isn't a huge concern imho.by cdru - Mechanics
Re: Cheap Bed Material - 9 years ago
Quoteo_lampeIs it a 200mm x 50m roll?I've seen 8" (200mm nominal) patches before, but never without an aluminum area or made completely out of aluminum. They are self adhesive, but wouldn't be very cost effective since they cost a few bucks a piece. I have seen large rolls at 36 inches by x 150 feet but you'd have to cut it yourself. It would cover 900 standard beds and cost about 5.5 cents a pby cdru - General
Re: Ramps 1.4 expansion via i2c? - 9 years ago
Quotealatnet i don't think it would be that much of an overhead as the expansion board will have a few commands to deal with. pretty much, turn extruder x on, extruder x motor rotate y steps, and so on.It's not that it can't be done. It can. But I don't think you're considering the whole process as a complete machine. If all you were doing was controlling functions where precise timing wasn't neby cdru - RAMPS Electronics
Re: Ramps 1.4 expansion via i2c? - 9 years ago
You could, although I would be surprised if you could get reason performance out of it due to latency, available bandwidth, and protocol overhead.by cdru - RAMPS Electronics
Re: Ramps 1.4 Heatbed Mosfet - 9 years ago
For #3, that should have been with D8 commanded off, not on. You should have very high or infinite resistance (open) For #4, 11.82 is close enough to 12 so that's ok. For #5, what is your resistance? You should have very little, enough to be considered a short. With the D8 MOSFET, what is the resistance between each lead. So the resistance between 1-2, 2-3, and 1-3? Lead 1 is the one closesby cdru - RAMPS Electronics
Re: Ramps 1.4 Heatbed Mosfet - 9 years ago
Please show a clear picture of your ramps board including the mosfet orientation. Also make sure the tabs of your MOSFETs aren't touching. This includes any heatsinks you might have installed. With bed disconnected: 1. With D8 commanded off, you should measure 12V between D8+ and PS- 2. With D8 commanded off, you should measure 0V between D8+ and D8- 3. With D8 commanded on, you should measure 0by cdru - RAMPS Electronics
Re: Comparison of belt stiffnesses - 9 years ago
That PDF is for tensile strength, not stiffness.by cdru - General
Re: Relay Board - 9 years ago
Are those the actual relay part numbers you're using? Or did you just use them for the symbols/layout? Those relays rated load is only 10 amps. If you're application is going to use PID or softPWM, your relays aren't going to like that electro-mechanically as well as being noisy. Finally, don't know if your schematic is otherwise finished or not, but based on how the wiring and symbols are laiby cdru - RAMPS Electronics
Re: Best $500 3d printer? - 9 years ago
Quotethetazzbotalso, I was referring to "can you measure the output", i.e. hold a pair of digital calipers to a print. It's painfully difficult to measure something .05 mm Print an object. Quit printing half way through a layer. Measure the difference between the unfinished side vs the finished side. Or measure your first layer. Or measure finished part divide by the number of layers printed.by cdru - General
Re: First time buying stepper motors: enough torque? [Question] - 9 years ago
How many do you need and what is your budget? Does saying you can't afford 60€ mean 59€ is ok? Or are you talking more like 50, 40 or 30€? Also from your image I presume you're located in France? Also if 60€ for steppers is too much, what about all the other required parts? Can you maybe skimp in other areas for the time being to upgrade later? Motors are one of the areas where if you skimp, yby cdru - Mechanics
Re: First time buying stepper motors: enough torque? [Question] - 9 years ago
The steppers we often use are sold with an indicated holding torque of 35-54 N·cm, (or 3.5-5.5kg·cm, 49-76 oz-in...they're all approximately equivalent). The motors you linked to have a holding torque of 50 mN-m, which is equivalent to 5 N-cm. In other words, those are an order of magnitude weaker than what you really need to be looking for. Unless you get lucky, you're probably going to need tby cdru - Mechanics
Re: Modifying PC ATX PSU - 9 years ago
QuoteDownunder35mI have dismantled and re-used alot of ATX power supplies and one thing I know for sure is that all 12V and 5V wires connect to the same point on the circuit board.Unless you have a split rail power supply, in which case what you know for sure is wrong. Be sure to check the nameplate ratings, silk screen, etc for indication if the 12V rail may be split. If it is, keep the rails wby cdru - General
Re: Xaphoon pocket saxofone anyone? - 9 years ago
QuoteMattMoses That is a great video - I like that guy's workshop.He reminded me of Roy Underhill if he was a surfer/beach bum.by cdru - General
Re: Ramps 1.4 servo issues - 9 years ago
Or...if you're using a PC ATX power supply just connect a 5V line to the 5V servo pin. No extra need for a regulator. In either case, an inline fuse isn't a bad idea Just In Case™.by cdru - General
Re: How do I get Cura to handle more than 5 extruders? - 9 years ago
Quotethe_digital_dentist What are you doing that uses so many extruders? Based on a previous thread, she is "extrud stuff like the frostruder" so not typical filament extrusion with a hot end.by cdru - General
Re: Patent Infringement on new CLIP technology - 9 years ago
QuotemisanOn the other hand, making your design public seems, again, not being restricted by the law.If your design is functionally identical to the patent, making "your" design public isn't illegal, however if it was implemented or you made claim that it was your invention could open yourself up to liability to patent infringement. However if you took their patent and improved upon it, making iby cdru - General
Re: best ramps 1.4 headbed mosfet upgrade - 9 years ago
I switched to the IRLB8743pbf a while back for my bed that draws 15amps. I have a fan that blows across the whole RAMPS board and the tab isn't even warm without a heatsink. With the default MOSFET and a heatsink, it would be almost uncomfortably warm to touch even with the fan blowing on it.by cdru - RAMPS Electronics
Re: Hardwiring E3D hotend fan to RUMBA 12V - 9 years ago
The 24V fan would be the simplest, but a cheap LM2596 buck converter would easily and efficiently knock the voltage down with plenty to spare if you had anything else you wanted to run at 12V.by cdru - Controllers
Re: Wiring Gauge - 9 years ago
QuotesimspeedThanks CDRU... I'm running a 24V PSU and the E3d Cyclops heat cartridge is 24V also. Should that take a lower gauge wire?The wire gauge you need to used is determined by the amount of current that will be flowing through the wire, not the voltage. Divide the wattage of your heater by the voltage to determine the current it will draw. So if you have a 40W cartridge, it would draw 40Wby cdru - General
Re: Multiple Heatbeds - 9 years ago
Depending on what your intended use is, you might be able to work around the limitation dc42 mentioned. You could directly hook up the heated beds to your power source bypassing the RAMPS board and just use the RAMPS board to switch the power. If you did this, you'd need to ensure that both beds weren't powered at the same time as you'd likely burn a trace and/or melt a connector. They just arenby cdru - RAMPS Electronics