After two minutes I can't touch my heated bed, so it's probably hot. It's true that I don't know what temperature my bed is exactly, but the temperature should be less fluctuating, because the delay between heater and thermistor is lower. I am using the extruder controller.by brupje - Reprappers
I haven't timed it yet, but from cold start it takes a few minutes. But I am using a alu block. The nichrome wire was much faster. The nozzle runs on 24W, while my heated bed takes 260W. That probably makes a difference too.by brupje - Reprappers
It is heating faster than the extruder nozzle, so that's no problem for me. I see why it might be less accurate, but I have no problems so farby brupje - Reprappers
I figured if I keep the resistors at 70 degrees, the heated bed will have a nice temperature of 55 degrees. Also the resistors won't get very hot, which should give them a longer lifespanby brupje - Reprappers
Thanks for the tip, I've ordered them and now have a working heated bed Some pictures:by brupje - Reprappers
Just add the line #define lego on in the configuration.h and you are all setby brupje - Wanted
I've added your image to the wiki...by brupje - General Mendel Topics
I fixed the last problem with a hardware fix. Just by connecting MS1 to ground and MS2 to vcc. That tells the A3977 to use 1/2 steps, like the other stepper drivers.by brupje - Reprappers
I am planning on selling ABS for cheap. But I need to know what the selling price should be, to be competative. The average price seems to be like 20$ for 0.5 kilo, with the lowest prices around 15$ for 0.5 kilo. Is there much demand for ABS? Do you know a supplier selling for less than 15$ for 0.5 kilo?by brupje - Wanted
It was easier than switching the cables, just turning up the torque was enough. next is to change the amount of steps, as my print is malformed: a big ellipse.by brupje - Reprappers
after testing every pin on the a3977 there was one pin not connected good enough. Only problem now is that the stepper is not turning, but I might fix that by swapping the stepper cablesby brupje - Reprappers
Thanks I fixed the heating problem, I switched the power mosfet. This helps at least a bit. next is to find out why the stepper is not turning. Is there a difference between the stepper 2.3 and stepper 3.0 tht might cause this? I am using motherboard v1.2by brupje - Reprappers
after hooking up the stepper it seems that it is not working at all. I can easily turn the stepper when the power is on, also when I move my y-axis nothing happens.by brupje - Reprappers
Last week one of my stepper drivers died I have been trying to fix my reprap ever since, but stepper driver are hard to get these days it seems. I have been able to get stepper driver 3.0 pcbs (http://www.thingiverse.com/thing:760) version trough someone at ebay though. I have tried to build two, but I am concerned with the results. If I hook up only power, the chip is getting hot pretty quicklby brupje - Reprappers
I checked it, the PLA does light up a bit when hit by UV. Not really much, but it is funby brupje - For Sale
I'd like to see how you tape your microprocessor to your PCB nice work though!by brupje - General Mendel Topics
I created a spreadsheet to help me with the calculations. Maybe it's useful for someone else tooby brupje - Reprappers
I was thinking about that, I have ordered another pc power supply, which has 2x12v lines. According to my calculations that should be 2x10A, with 2x2 resistors (2.2ohm). I have two vnp ic's left, after blewing one up, so no problem there Thanks for the suggestion.by brupje - Reprappers
Thanks. I guess you are right. I put small heat sink on it, but still overheats. It's ridiculous, the power supply is getting hot faster than my heated bedby brupje - Reprappers
with the same resistance, 2.2 x 3, running at 5 volts, things seem to be better. The vnp20n07 is still getting very hot, which is what worries me. But the bed is getting warm, not hot. S next step would to get lower resistors I guess.by brupje - Reprappers
The 5+ line has 22A. I tried hooking up to the 12 rail with 3 resistors. They were getting hot and the power supply seemed to be ok, although it kinda makes high noices. When I put the vnp20n07 in things are not ok. The vnp20n07 is getting very hot. I am pretty sure I hooked it up alright, so I don't understand why.by brupje - Reprappers
About 2 mm in diameter or soby brupje - Skeinforge
My holes got somewhat bigger in the latest skeinforge using stretch. But I have put "Perimeter Inside Stretch Over Perimeter Width" to 6 and "Perimeter Outside Stretch Over Perimeter Width" to 2by brupje - Skeinforge
Ik heb blauw PLA in de aanbieding. 10€ voor 0.5 kilo, excl verzendkostenby brupje - Dutch User Group - Archive
So if i have 4 2.2 ohm resistors 12²/2.2 = 56.45 , 56/12 = 5.45 A , 5.45 * 4 parallel resistors = 22A. Correct? My PC power supply says it has 6A on 12V. So that is a no-go then?by brupje - Reprappers
Looks OK to meby brupje - Controllers
Giving the stepper more torque might help as well...by brupje - General Mendel Topics
This is the one I used, I don't know what you mean by "standard". What ratings does it have?by brupje - Controllers