Oh For Heaven's Sake!

[Jules]

Thought about putting in a full-house generator, we do get a lot of hurricanes around here.

Bought an M2 instead.........

[lem]

I checked with the Simplify3D folks, here's what they had to say:

Thanks for contacting Simplify3D, I will be happy to help answer your question. In regards to the communication between Simplify3D Software and the printer, there is no checksum in our protocol, and we use the standard RepRap style communication. The software will make sure it receives and ok response from the printer to hopefully catch any errors in the communication should they arise, either from faulty usb cables, mismatch baud rate speed, etc., but there is no actual checksum or verification done on the communication stream.

The farther we come, the farther behind we get.

[insta]

Argh it's such a simple thing to add, too. It's literally built into the Marlin firmware already.

[jdacal]

Wow no checksum! That's such a basic thing, I wonder what their reasoning is.

EDIT: Maybe that explains those rare times when I wake up and find the bed laying on the bottom in the middle of what appears to be a normal print job.

[Ronnien55]

I had the same thing happen twice, i use usb to my MAC pro 2009 and Simply3D. I found that I had turned on my screen saver both times this happened. Whenever I am printing I turn screen saver off and it has not happened again. Not sure why that would cause an interrupt in USB communications.

[lem]

I wonder if there are enough S3D users here to get S3D to implement an option in S3D to use the checksum feature?

Larry

[ednisley]

turned on my screen saver both times this happened

Most likely, when Windows activates the screen saver it also triggers the power management functions: spin down the drives, slow the CPU, and turn off power to peripherals like, whoops, the USB ports.

The Arduino on the RAMBo board interprets that as a communications reset and pretty much stops whatever it was doing at the time. I don't know if you could recover based on command checksums, but at least you would know something awful had happened.

[Jules]

Well, I've learned my lesson.....any print over an hour goes onto the SD card.

[jdacal]

Well, I've learned my lesson.....any print over an hour goes onto the SD card.

I've had the bed drop on me from SD cards too. I've had it happen with the Raspberry memory and on the SD with the same print at the same spot on the print. In those cases I go back and make some minor change on SD3 and regenerate the file. Its pretty rare though.

[Jules]

Great!