Homing Rostock - Solved

[cbuddha]

Aloha - Noob here
This is my first 3D printer I love the kit and it's all built.
Excuse the long post I'm trying to include all pertinent info:
I am good with computers and mechanical things but this is really baffling. I got my kit on the 16th (I'm not with the printer or box so I'm not sure when it shipped)
I have used a multimeter to verify the following: Endstops normally closed and open when pressed. No shorts to the print head on both resistors and thermistor - 4 ohms resistance on the printhead and 2 on the bed. 100K+ on both thermistors.
I have installed Repetier 0.82b for Windows (I tried Linux, but gave up for now) I downloaded RMAX firmware from github and Arduino "22" but did not install nor run those. I launched Repetier and got “connected” to the printer. The log display near the bottom shows compiled Dec 12 2012 Firmware Marlin for Delta. So far so good it seems. I configured the printer per instructions, though I missed the HOME settings and changed those to spec after the mishap. HOME X and Y 0 Z = MAX. I tested the endstop switches using M119 and they behaved nominally.

I issued G28 and the all three axis’s moved downward. Due to a bad physical layout of all things I couldn’t reach the power switch and used Emergency stop in repetier to shutdown there was a brief headcrash to the bed. (fortunately it looks fine)

I removed the all arms after that. Following the advice in the build PDF I swapped Red with Blue on all axis’s - I found the config file but it seemed easier to switch wires.

After that I did G28 again - the Z carriage homes up and X then Y carriages head down(I homed X by clicking the switch and Y headed down too)

I then thought X and Y motors were originally correct so I put them back. Same result.

If I swap Y wires only then X homes first.

Troubleshooting Notes -It said somewhere to reset after changes. I physically switched off the power supply and closed repetier in any number of combinations thinking I would start anew each time but I’m not sure if that did anything. I noticed on the RAMBO webpage photo a physical reset button on the RAMBO but found that after I stopped troubleshooting so maybe that will solve things.

I tried to manual control axis movements to get a grip on the motor movement but I guess due to delta kinematics it doesn’t correspond to each axis carriage.

Mahalo

Problem solved via software

[cbuddha]

Gave up on the wiring and went back to the original wiring and used the software fix. It works now. It wasn't too hard but finding all the documentation in one spot was tough. I'm working on a guide for that. I do not recommend flipping wires, it caused some strange problems.

[Craftgizmos]

I'm in some of the same trouble and need help with understanding how to make the software/firmware change to fix the motors moving in the wrong direction. I tried flipping the wires, but then I keep getting an error message about "Last line number not last number +1" and the up down arrows in repetier don't seem to work right, and I have to keep issuing an M999 code to restart and then after a few steps it goes back to the line number error message.

[cbuddha]

Aloha

First off, in between all changes, we were very paranoid and closed repetier, powered Rostock off - then on, relaunched repetier, then hit the reset button next to USB port, . It would probably suffice to just reset but we wanted to be "val" fer shure-fer shure ya knouw. Try resetting to clear the error, if not you might have to re-flash the RAMBO

Make sure you have dowloaded unzipped/installed the Johnoly99 zip file from github/arduino ide 0022

Here's what we did step by step: (version from memory - not with my baby at the moment and on my mac)

look for your directory of the zip file Marlin-for-rostockmax-rambo-master/Marlin look for configuration.h make a copy as a backup and name appropriately

open configuration.h with text or wordpad

look for #define INVERT_Y_DIR false (there's an X,Y and Z - change all three if it moves downward on G28)

change false to true - save file

close repetier and launch arduino

go to file open and open the Marlin-for-rostockmax-rambo-master/Marlin directory open configuration.h It should load different modules each with a tab (Marlin, configuration.h, configuration.adv, etc) highlight the configuration.h tab and press the play button it should finish with "Done compiling" hit the upload button, your RAMBO should show activity lights, when finished it shows something like compile complete.

reset RAMBO

close arduino and relaunch repetier - connect to Rostock, sometimes we had to reset RAMBO to reconnect.

You should be good, if you get the last line error try to reflash all the other components in the master file, I suppose. Be sure to close repetier when flashing.

Good Printing! I'll work on a guide after I get back to my baby

[cbuddha]

Make sure you go back to the original wiring as well.

[Polygonhell]

I'm in some of the same trouble and need help with understanding how to make the software/firmware change to fix the motors moving in the wrong direction. I tried flipping the wires, but then I keep getting an error message about "Last line number not last number +1" and the up down arrows in repetier don't seem to work right, and I have to keep issuing an M999 code to restart and then after a few steps it goes back to the line number error message.

This is an issue with the USB connection, basically the printer is expecting to get sequential line numbers from the host software and it's either getting a corrupt GCode line or losing a line.
Make sure your USB cable is as short as possible and away from any other wiring as far as possible.
It can also be caused by bad wiring, most notably either a loose ground wire or one not connected to ground.