Friday, April 06, 2007


Stopping corner blobbing

I added some code to the firmware which reverses the direction of the polymer pump for 25 milliseconds at the end of an extrusion path. The good news is that that seems to greatly reduce the corner blobbing. The bad news is that I now seem to have a drift from layer to layer on the x-axis.

I'm going to disconnect the new firmware code and see if that goes away. I'm beginning to think that using the WaitMs command when you are running interrupt driven code causes problems. It that is the case it will be no big problem because I have a 1 millisecond pulse written in to the interrupt code that I can count instead of using the WaitMs command.

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