I downloaded the reprap host software a couple days ago. I got it to work great with my arduino and it controls my stepper motors perfectly. But today I couldn't get my extruder to work, and I had an old battery operated dremmel. Insted of trying to fix it, I thought I should try it out. I went into preferences and picked subtractive: true and I put 0 for the number of extruders(BIG MISTAKE). Then the next time I opened the software it said: A reprap 3d printer must have at least 1 extruder, and then the software froze. I tried everything, including reinstalling it and nothing worked.

I NEED HELP!

Thanks,
Elijah

Also, I NEED and answer ASAP. I'm doing a robotics comp. and need it working by then.

You can modify the preferences file directly. On Linux systems it is stored at ~/.reprap/reprap.properties

Somewhere in that file should be a line defining the number of extruders.

I doubt anybody has tried the subtractive option so it probably does not work. Subtractive tool path calculation is a lot more complex. If it just swaps inside for outside, and works top to bottom then it will have have tool crashes.

To get back to where you were you probably need to delete the file that stores the preferences. Where that is depends on whether you use Windows, Linux or Mac. I don't use the software myself so I can't tell you the exact file name but it will be something with reprap in the folder name in wherever your OS keeps personal files. E.g ~name on Linux or "Documents and Setting\name" on Windows, I think.

[www.hydraraptor.blogspot.com]

Thanks! I will search for the file... I'll let you guys know if I get it working. Also, does anyone know any CNC subtractive software that works with the arduino?

GREAT!! IT WORKS!!

Thanks for all of your help,
Drummerboyx