Show all posts by user

Nothing gets to work with a very large scale 3d printer - 8 years ago

Hello fellows, I built a 1.8 m X 1 m X 1 m XYZ FDM robot based o RAMPS1.4, Arduino Mega, and Marlin 1.1.4. Every thing was going very nice meanwhile but recently everything went crazy !! what exactly happens is as follows: 1- System resets after about 4 hours of working which my still in the first layer. I increased the cooling on the board and I felt like I have solved it. 2- the next thing wa

by Osama - RAMPS Electronics

A strange shift in the x-axis direction ... electronics or software ?? - 12 years ago

Hi Reprappers ... I built a new 3D printer "SimpleBot V1.0" you can find it here : now I'm having serious calibration problems !! the first stupid thing is that big shift or wrong travel in the x-axis direction... you can see that in the attached pictures : I hope you have a cure for my problem ??

by Osama - Reprappers

Re: Problem configuring my hotend thermistor - 12 years ago

well I got it working correctly thanks god ... the problem was bad connections in my circuit ... I did it with an already drilled PCB and wires soldered to it. but now I face another strange problem !! I think the reading of temperature has caught NOISE !!! if the reading is stable at 160 degree with no extrusion. then when I try to extrude some plastic then the readings fluctuate from 130 to 450

by Osama - Reprappers

Re: Problem configuring my hotend thermistor - 12 years ago

I've got the AD595 IC and built the PCB following the instructions of this: but I still have very bad readings of temperature !! it always reads from 450 to 499 celsius !!!! I modified the sprinter firmware to cancel the analog pin that reads a thermistor and let A3 pin to read a thermocouple. also I modified the repetier firmware to work with AD595 but it gives the same results !!! are there

by Osama - Reprappers

Re: Problem configuring my hotend thermistor - 12 years ago

Quoteuncle_bob I'd spend the $50 and get a real hot end .... the best advice from a wise man thanks uncle bob

by Osama - Reprappers

Re: Problem configuring my hotend thermistor - 12 years ago

I figured out something new !! Um sorry for my dumbness but .. I realized that the temperature sensor in my hot end is not a thermistor !! it is a k type thermo couple !!!! of course you know the difference between a thermistor and a thermocouple .... is there a solution for such a problem ?? for the RAMPS 1.4 or the Arduino Mega 2560 to read from a thermocouple ??? thanks in advance

by Osama - Reprappers

Re: Some help with ramps - 12 years ago

you can start reading about ramps from here: Note: RAMPS doesn't read thermocouples. you must use a thermistor !!!

by Osama - General

Re: Problem configuring my hotend thermistor - 12 years ago

I made a test for the analog input pin that takes readings from the thermistor A13 and controlled the output for the heater on pin 10 by this code the corresponding LED on the ramps is lighten with constant intensity and doesn't vary in its illumination ... I'm really confused now !!

by Osama - Reprappers

Re: Problem configuring my hotend thermistor - 12 years ago

um sorry annoying you again, but here what I ended for: I unplugged the thermistor from the hotend and ramps and tested it ... the ohm value changes when it is heated manually ... but still in the ranges from 13 to 8 celsius when heated. the crazy thing is that even when the thermistor is unplugged from the ramps reptier and pronterface still reads value higher than the highest value in the therm

by Osama - Reprappers

Re: Problem configuring my hotend thermistor - 12 years ago

in my room temperature which may be 22 celsius, my Ohmeter reads 13.5 ohms !! MK8 is Makerbot8 extruder: anyway, when I choose any configuration from the 7, it reads a value higher than the highest value in any thermistor table !! and the heater doesn't then work. thanks for your fast replies

by Osama - Reprappers

Problem configuring my hotend thermistor - 12 years ago

hi people, I'm new here and I hope you can help me with this issue. I bought the MK8 complete assembled extruder, RAMPS 1.4, & Arduino Mega 2560 and got started building my own 3D printer and here comes what I faced: I successfully uploaded the "Sprinter" firmware by kliment from GitHub and already have ran all of my stepper motors (X-axis, Y-axis, 2 Z-axes, & the extruder motor). Now I d

by Osama - Reprappers