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Jun 2016
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101010
Jun '16

Anyone have any problems as to setting up a Kossel Mini? I still need to tune the motors, use OpenDACT or manual calibration, and start printing cubes…

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    Jun '16

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    Jun '16
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Cello
Jun '16

Here a procedure a friend if mine from 3D Printing Academy in Hong Kong sent me:

During our last workshop at CDNIS, we have developed a new, streamlined way to calibrate the Deltas without the need of the Autolevel Probe! It looks complicated but if performed carefully, it should not take much longer than 15 minutes per printer. We did 10 printers in one afternoon:

New Calibration without Z-Probe

a. Important: wash Glass Bed with soap to remove any residues from factory. The residues render the UHU glue useless.
b. Start Printrun and enter: M666 H265 X-5 Y-5 Z-5, store with M500
c. Home, then move Head to X: G0 X-73 Y-42 Z5 F6000 (you can program it in Printrun)
d. Manually move head down until nozzle is paper thickness above glass bed
e. Example: If display shows 2.1mm, then 5 - 2.1 = 2.9 enter: M666 X-2.9
f. Home, and repeat for X until nozzle exactly 0.1mm above glass bed; store with M500
g. Home, then move Head to Y: G0 X73 Y-42 Z5 F6000
h. Repeat d) e) and f) for Y
i. Home, then move Head to Z: G0 X0 Y73 Z5 F6000
j. Repeat d) e) and f) for Z
k. Repeat again c) - j) for X, Y, Z and adjust if necessary
l. Store with M500
m. Once X, Y, Z are all exactly 0.1mm above glass bed, home and move head to center: G0 X0 Y0 Z5 F6000
n. Manually move head down until nozzle is paper thickness above glass bed
o. Example: If display shows 0.1mm, then (250 – 0.1 = 249.9) enter M666 H249.9
p. Store with M500

Your printer is now perfectly calibrated and does not need G29 Autolevel anymore!

Remarks: If you forget the settings, you can always check with M666 L.
If you get inconsistent results then most likely one or more of your spur gears are slipping and/or endstops are not well fixed. Check and tighten.

101010
Jun '16

I have tried doing it with that method and the delta radius with the dish and bowl was always throwing it off.