Hi i am new to hobby, I've been given a prusa knockoff , the main board (Meltzi) is not working right, I can home all axis but that seems to be all, I would like to replace board but have no idea how to program it, I understand using Arduino and Marlin but do not understand necessary changes needed, I understand how to compile and upload. I quess my main question is it possible to buy the boards pre programed ? I am not able to get original copy of program.
Thanks for any help you can offer.
Terry

Most of us on this Forum would help you to get the correct configurations for your 3D Printer. This can go quick or at times can take quite a lot of time.
It would help to know more information about your Prusa knockoff.
Marlin is fairly simple to configure and works with

BOARD_MELZI Sanguino pins_MELZI.h Melzi
BOARD_MELZI_CREALITY Sanguino pins_MELZI_CREALITY.h Melzi for Creality
BOARD_MELZI_MAKR3D Sanguino pins_MELZI_MAKR3D.h Melzi "MaKr3d"
BOARD_MELZI_MALYAN Sanguino pins_MELZI_MALYAN.h Melzi for Malyan
BOARD_MELZI_TRONXY Sanguino pins_MELZI_TRONXY.h Melzi for Tronxy

RepRap Prusa Calculator.

You could try reading out the memory of the Melzi board. Connect it via USB and use pronterface to send M503. The answer will tell you a lot about the current settings. ( copy&paste it in a .txt file for later reference )

When homing works but nothing else, it might be possible to get the Melzi board running.
Tell us more about the temperature readings ( after homing ) or error messages.

My guess is, there's something wrong with endstop config and homing/stepper direction. ( a common problem for newbies )

Thank you for the two replies, I will dig a little further, the homing works perfectly, but i had no heat to the board or extruder, after much fooling around they started heating but went far past settings before I shut it down. I definately will try your solutions.
Thanks Terry

Hello;

As I find information will post here
Check the processor on your board to see if it is the ATmega644 or ATmega1284.

#define BOARD_MELZI 63 // Melzi
#define BOARD_MELZI_MAKR3D 66 // Melzi with ATmega1284 (MaKr3d version)

M503
SENDING:M503
echoteps per unit:
echo: M92 X100.00 Y100.00 Z400.00 E90.00
echo:Maximum feedrates (mm/s):
echo: M203 X400.00 Y400.00 Z4.00 E50.00
echo:Maximum Acceleration (mm/s2):
echo: M201 X3000 Y3000 Z1000 E5000
echo:Acceleration: S=acceleration, T=retract acceleration
echo: M204 S1000.00 T3000.00
echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s), Z=maximum Z jerk (mm/s), E=maximum E jerk (mm/s)
echo: M205 S0.00 T0.00 B20000 X20.00 Z0.40 E5.00
echo:Home offset (mm):
echo: M206 X0.00 Y0.00 Z0.00
echoID settings:
echo: M301 P22.20 I1.08 D114.00
Hi this is what I got after downloading Pronterface and typing M503, makes no sense to me. Still homes properly including z height. No heat to bed or extruder. Just tried it again, bed and extruder stated heating, extruder set at 190c, went on past and I stopped it at 245c was still going higher.

Edited 1 time(s). Last edit at 05/23/2018 07:15PM by skaha.

Most of your numbers are identical to my 3D Printers. As we have different Lead-Screws and Belt Pulleys The differences are normal.

Try to send a M502 ("Reset firmware defaults") then M500 ("Store Settings") Reboot 3D Printer. This will re-set the printer to Firmware defaults.

And try to heat extruder again.

Edited 1 time(s). Last edit at 05/23/2018 09:49PM by Roberts_Clif.

maybe the thermistors for bed and hotend are in the wrong terminal? With pronterface connected, you could heat up the extruder and see, which temperature changes in pronterface. ( the temperature of your fingers will be enough to heat the extruder up a bit )

Hi still having heating problems, I think the board is a Melzi sanquino pins. I have tried all the suggestions but the problem is still with the plate and extruder, I let it go on up and the extruder reached cut out temp and shut off.
I think this is beyond me, but thanks for trying to help.
Terry