Coordinate corruption

[koenkooi]

I've been trying to build the makerbot mini (thing:2626) for the past 2 days now and the last 5 tries failed due to the x stage trying to commit suicide or a high pitched whine from the y stage.
After pressing "stop" and opening the control panel the x or y will be at values around 2000 or so. It doesn't happen always at the same point.
This is with printing from SD, since printing from serial will give a timeout after 3-4 layers.

This is with the latest firmware from git master on both extruder and mainboard, as well as the latest git of repG.

[makerbot]

Hi,

Does this happen at the beginning of an SD build, or midway through?

[koenkooi]

midway, it usually happens after approx 20 layers with the mini makerbot

[koenkooi]

A more visual example: http://www.flickr.com/photos/koenkooi/4729416091/

When I pressed 'stop' and opened the control panel, the values for x and y were '9349' and '3312', the z value was ok.

[koenkooi]

This .s3g always shows the problem when built from SD: http://dominion.thruhere.net/koen/OE/20mmbox.s3g

It will move left instead of right straight after the extruder has finished heating to 220

[koenkooi]

I'm starting to think this is a problem with reading from SD, since placing the same s3g on a different part of the card (e.g. using a different name) can make it work.

[koenkooi]

a few dozen prints later, I can confirm this is due to using OSX to put things on the SD card, uploading thru serial works fine.