Re: Heatbed Heater Options
Ok so after looking at the SSR option, I'd rather avoid having to wire up two plugs for the printer. What's the deal with the mosfet option? How is that wired up? Is there a guide somewhere?
View ArticleRe: Heatbed Heater Options
What you need is something like the SevenSwitch, but with 2 mosfets in parallel to handle the extra current. See [reprap.org] and follow the link to github for the schematic.
View ArticleRe: Heatbed Heater Options
Now this seems like a really interesting solution! A little board and some mods to the firmware, I think that's manageable! As far as the MOSFETs in parallel, I had a read through the SevenSwitch...
View ArticleRe: Hot end suddenly not heating up
Thanks. I measured the D10/ground voltage as suggested, and I do get the 12V off and 0V on measurements that you described. I really don't see any bad joints around the heater itself, and like I said...
View ArticleRe: Heatbed Heater Options
Ignore the current rating of the mosfet. Instead look at the Rds(on) value measured at Vgs=4.5V and Id at least as high as the current you want to switch. For the irl8743 used in the SevenSwitch it is...
View ArticleRe: Hot end suddenly not heating up
Hey guys, Have a similar problem. My machine is only a couple weeks old but I have done about 100hr of prints already. Anyways I had a 16hr print fail last night and the nozzle was all goo-d up this...
View ArticleRe: Hot end suddenly not heating up
Well I figured out my problem. When the heater end shorted it burned a trace on the back of the board directly behind the D10. Soldered the trace back together and she is printing again. Since the hot...
View ArticleRe: Large Printer Electronics Decision.
QuoteChunks87 The only thing more fun to me then actually printing things that I 3d model is designing the 3d printer itself! I'm going to look into the smoothie board and the beagbone black that you...
View ArticleRe: Proper Resistance of a Heated Bed
QuoteCefiarNote: I've successfully used Phoenix removable screw connectors (the two-part ones) in place of the standard screw connectors. Thanks. I searched the Phoenix website but there are a lot of...
View ArticleRe: Heatbed Heater Options
Cheers for that! I might actually be ok with just the normal sevenswitch. The resistance of the heatbeds are between 1.1 and 1.4 ohms, and if the 15A is going to be just for the heatbed, I might be...
View ArticleHeatbed makes clicking noises
Hi all, when i connect my heatbed directly to my RADDS, the heatbed itself makes clicking noises. The sound comes directly from the heatbed (Standard 12V 160W Silicon-heater). If I use a SSR at the...
View ArticleRe: Proper Resistance of a Heated Bed
QuoteGarry Bartsch The PDF shows a trip rating of 18.7A beside the 11A holding rating. So the fuse would trip at 18.7A? But I assume it would not trip instantly at this amperage due to it's...
View ArticleRe: Proper Resistance of a Heated Bed
QuoteGarry Bartsch I'm guessing that different RAMPS manufacturers use different terminals? Would the Molex terminals called for in the RAMPS wiki be about the best quality going? Without having many...
View ArticleRe: Proper Resistance of a Heated Bed
QuotecdruIn other words, in a 20°C room, you can expect to get at least Ihold but not more Itrip on a sustained basis. Thanks for elaborating. And as the ambient temperature rises both of those...
View ArticleRe: Proper Resistance of a Heated Bed
QuotecdruAlso, Molex is just a brand name. Saying that a Molex connector is better suited for a job doesn't mean anything unless you state which Molex connector. Yes. I guess I'm just wondering if...
View ArticleRe: Proper Resistance of a Heated Bed
QuoteGarry BartschThanks for elaborating. And as the ambient temperature rises both of those numbers would go down? In my case in summer my room with the printer gets hot: 28-30C sometimes. So a fan...
View ArticleRe: New soldering iron, questions
3 to 5 seconds are entirely fine for a solder joint. Given that most components are made for surviving soldering in a hot air oven it became almost impossible to break them by overheating with an...
View ArticleRe: Need to flash bootloader
USBtiny is often reported to support only ATmegas < 64 kB: [reprap.org]
View ArticleRe: Need to flash bootloader
I was only planning to use it to flash the boot loader. That shouldn't be bigger than 64k, should it?
View ArticleRe: Need to flash bootloader
It's not the size of the bootloader that's the problem, it's where the bootloader goes. See [forums.reprap.org].
View Article