I’m late to the party, but my Kossel is printing now.
John and Kevin have been extruding filament for a week or two already.
The USB problem turned out to be a driver issue. Isn’t it always?
The SD card can’t be mounted as a mass storage device while you are printing or windows interferes with it by doing housekeeping reads and writes to the SD card at random times.
The results of the Kossel calculator shown a few message back turned out to be useless. The correct delta radius was determined experimentally with many iterations of changes and retests. Creating hotkey macros in Repetier host definitely saved a lot of time though. I considered trying Pronterface briefly, but it got uninstalled almost immediately after playing with it for a few minutes. What a POS. If you are using Pronterface, you really should try Repetier - it’s much more powerful and refined.
The z-probe is all hooked up and ready to go, but I haven’t tested it yet. It’s printing beautifully with the manual calibration. The quietness of the machine is eerie. I’m using 1/32 microstep drivers in the AZSMZ mini controller and the fans are almost the only noise you can hear. Amazingly smooth compared to my DaVInci V1.0 - which gronks and buzzes loudly while printing.
Here are some small “hello world” objects.
“Marvin” on the left. 250 micron. I think the extruder temp was a bit too hot.
Makerbot “Make” robot on the right. 200 micron. Printed a little cooler, but maybe still a tad too hot.
Noticeable difference in resolution between 250 and 200 micron.
Here is a somewhat larger object. Nittany Lion scan found on thingiverse. Printed at 250 micron. Now printing at 185C. This seems better.
Here are a couple of just completed views. Support material under the chin not yet removed.
This was a 3 hour print spooled from Repetier host across the USB. Apparently the USB communications is solid. I still plan to go WiFi as I did on my other printer.