Its still the voltage regulator on the mega... not sure how many time I can say this till it sinks in.by Dust - Reprappers
marlin uses endstops, if these are triggered it will not move send the board a M119 command it will display the current endstop status Secondly the vref needs to be set on the stepper drivers to match you steppers. Thirdly you need to provide the ramps with the correct power, there are two circuit a 5amp circuit which powers the steppers, and the 11amp circuit which just powers the heated bed.by Dust - Reprappers
The firmware will not allow you to turn the heated bed on if it can't read a sane bed temperature So you need to get the bed thermistor sorted first, before you can ascertain anything else. While not heating swap the hot end thermistor and heated bed thermistor plugs around on the controller, does the hot end keep reading room temperature or does the fault move? Now put it back before you forby Dust - RAMPS Electronics
here is a standard pololu Check you have 5v from VDD to the GND under it If you have no 5v there check its coming onto the ramps at all On On aux-1 check from gnd to +5v Still nothing? The mega is probably not producing 5v.by Dust - Reprappers
you have fed +12v into the +5v side of things, that’s very bad. basically everything that was expecting +5v is very likely dead First question is can you do SMD rework? if no, then the mega is not repairable by yourself. and they are like $9 from china, not worth anyone else time 1) I wouldn’t even try to check any of it... its not worth killing additional hardware. you need a good knowledgeby Dust - Reprappers
You still need power in the ramps power plugs as they and only they feed 12v (or what ever your feeding it) into the stepper drivers vmot supply Or are you just not getting 5v at all? if so, dead voltage regulator, presuming you feeding the ramps dc jack with 7-12Vby Dust - Reprappers
decrease your max feed rate for Z in your firmware eg in marlin #define DEFAULT_MAX_FEEDRATE { 300, 300, 5, 25 } the 5 is the Z feed rate and this is to fast for a M5 based z axis change it to a 3by Dust - Prusa i3 and variants
'Parts' from 2 x surface mount 1206 size on the MK2a or conventional through-hole LEDs. Install with opposite polarity so one or the other will light up regardless of the polarity of the power supply to the board. 1 x 1K ohm surface mount or through-hole resistor The 1K resistor is the important part, limits how much current goes threw the led.by Dust - Reprappers
It means you cant achieve maximum torque with those steppers and drivers. If it will work depends on the friction involved on each motor/axis and the torque delivered at the current provided. easiest just to try it...by Dust - General
On the stepper drivers is two pins vmot and the gnd next to it. If you remove those two pins form the ramps, you can plug 24v directly in there. Some people put in the two pin pointing up, and then just plug in 24v. (just be sure there is no connection threw to the original ramps 12v pins)by Dust - RAMPS Electronics
does you bed read room temperature when at room temp? (or close enough)by Dust - General
In your configuration.h is #define PIDTEMPBED set? (ie no // in front of it)by Dust - General
What command are you trying. What type of bed? But since the error says "Bad extruder number" Im guessing you have the syntax wrong...by Dust - General
There are full manuals online for this printer check out Original_Prusa_i3_MK2S_kit_assembly user manualby Dust - Prusa i3 and variants
"heated bed: temp sensor defect" Its not reading room temp on the bed and panicking check endstops are working with M119 command, ie send M119, then hold endstop and send M119 again, does the endstop you expect to be triggered now say triggered?by Dust - RAMPS Electronics
The big blue connector is for power.... its separately powered from the ramps etc.by Dust - RAMPS Electronics
yea, your missing a very active topic in general External Mosfet boards actually quite good!by Dust - RAMPS Electronics
NB The central holes are not centered, its offset slightly on the Y axis. (or the cutout is not equal) eg When you upgrade from a mk1 to a mk2 they give you a tool to identify which side is which see step 7-9 Also 4 bearing is over constrained and makes things worse over 3 bearingsby Dust - Prusa i3 and variants
I would guess you put +12 and gnd on the wrong pins and annihilated the reverse protection diode 12v 30amps is fine. If you take a look at Along the bottom on the left you have the power plug, two polyfuses (one for the 5amp and one for the 11amp rail) and then the protection diode d2by Dust - Reprappers
There are 6 mounting holes, 2 additional in the centre that theY-belt holder screws threw the plate into. So heated bed is held on plate in 6 points Measured, with a ruler the 4 outer mounts seem to be 208.8mm apart. Centre of each mount is difficult to judge, its a hole... From the board schematics in eagle measure 209mm so I would go with that.by Dust - Prusa i3 and variants
use command line gcode g1 with parameter f feedrate f is in mm/min eg g1 x50 f6000 move x by 50 (or to 50 is absolute mode) at 100mm/s (* by 60 for mm/min) This of course depends on your steps/mm values being correct Also be ware of max feed rate value in firmware. These will clip at that value.by Dust - RAMPS Electronics
I would suspect you have damaged the main controller cpu. Several I/O pins no longer work as they should. But first re upload your firmware, sometimes a fault like this just needs a firmware reflash.by Dust - Reprappers
Two different programmers, same results.. 1284p chip is probably damaged.by Dust - Firmware - Marlin
Find the boards.txt file that lists all these boards Its very human readable, find the baudrate and protocol for the 8mhz board and copy it to the 16mhz version. NB you must restart the Arduino IDE to reload this file. Give this a tryby Dust - Prusa i3 and variants
huh. why are you trying to put a 1284p bootloader onto a attiny45? or -p is in error and should be atmega1284p -p is the target processor, not the isp processorby Dust - Firmware - Marlin
There are numerous causes of this error The simplest is there is a jumper on the board which needs to be in place to allow software to reset the board JP2 in your picture. Without this it doesn't reboot and can't run the bootloader. If that fails... your in a world of hurt. Either the boot loader is not installed, you need a avrisp (which it looks like you have) to put one on. NB USBtinyISP wiby Dust - Prusa i3 and variants
1) there is a whole forum dedicated to printing, you might want to look in there 2) none of the samples links works.by Dust - General
On the Ramps the 5v pin you are using does not have 5v on it That connector the top pin vcc has 5v. That connector is normally used to make the 5v pins on the servo connectors live by putting a jumper from vcc to the 5v pinby Dust - RAMPS Electronics
remove everything you can from the ramps, and try again (no endstops, stepper drivers, or power) Does it still do it? If it does still fail you you have a dead ramps. There has been a rash of these that have shorts on the pcb tracksby Dust - RAMPS Electronics
The test firmware does not look at endstops The real reprap firmware will not move if endstops are triggered Send the controller a M119 command Any that report triggered, you cant move in that direction.by Dust - Let's design something! (I've got an idea ...)