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Another 3D Printer

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Jorkki:
I had some head banging myself due to too fast printing speed on a small layer so the plastic did not have enough time to cool.
I got better results after I switched from Slic3er to MatterControl. Actually I'm not sure if it was the slicer switch, because I set the Z-lift to 0.15mm and increased the retraction length to 4mm at the same time, but there may be other subtle differences between the slicers.

If you have Z-offsets in the print head height paper test and you can't fix them mechanically, you can do the same as I did and put the offsets in the bed.g file.
The idea is to adjust the Z-offset to 0 at P9 (origin) by adjusting the probe offset in config.g (in the G31 command) and put the offsets for other test points in bed.g.

My values are as follows:
G30 P0 X-73.6 Y-42.5 H-0.10 Z-99999   ; X tower
G30 P1 X0 Y-85 H-0.15 Z-99999      ; between X and Y towers
G30 P2 X73.6 Y-42.5 H-0.10 Z-99999   ; Y tower
G30 P3 X73.6 Y20 H0.10 Z-99999   ; between Y and Z towers
G30 P4 X0 Y67 H0.05 Z-99999      ; Z tower
G30 P5 X-73.6 Y20 Z-99999   ; between Z and X towers
G30 P6 X-36.8 Y-21.25 H-0.05 Z-99999   ; half way to X tower
G30 P7 X36.8 Y-21.25 H-0.05 Z-99999   ; half way to Y tower
G30 P8 X0 Y42.5 H0.05 Z-99999      ; half way to Z tower
G30 P9 X0 Y0 Z-99999 S6      ; centre

The sign is so that e.g at P1 my my bed is high, a 0.10mm paper read 0.25mm on the Z display and at P3 it's low so the 0.1mm paper read 0mm.

I do have access to a lathe at my brothers, but I think I'll gather some experience first and see what else I'll learn.
I just printed Emmett's Gear Bearing from Thingiverse to test. It's a quite nice example of things that you can't build or take apart, you have to print it.

Joules:
You got really good print quality there Jorma.  That's what's making the niggles worth solving.  This little printer is capable of very high quality work.   My fear about the extruder was justified when a filament jam popped the large gear and pinch roller out  :bugeye:

I hope it was just a one off, but I still have an all metal extruder on my upgrade list.  That said, a second Mini Kossel will probably join this one shortly.

Jorkki:
Outch!
Can't really beat metal for certain applications.

Of the printed ones, the coolest looking I have seen is Drew's planetary geared extruder:
http://www.thingiverse.com/thing:39138

Also I kinda like the simplicity of the design that Builda3dprinter.eu has in their kits.
The guy is showing the build in this video:
https://www.youtube.com/watch?v=u3npxBuSv0Y
They sell the geared motor and stainless steel spur gear on their web site as well:
http://builda3dprinter.eu/shop/page/2/
The plastic part stl file is in the information/downloads section.
I have no idea of it's durability though, probably would be a good idea to print a spare or two just in case.

Joules:
Ha I printed Drews planetary extruded when he first released it with the intention of using it on a Rostock Max.  I like the YouTube video and extruded design might exchange the printed part for alloy machined part.  I do like the other Kossel machines on that site, but won't ever go back from a 32 bit controller now.

Setting the printer up for another test print.

Joules:
First test print with everything dialled in.  These are shell prints, in effect a spiral movement to print a single layer.  The objects you see are nose cones for a small model glider.



The print on the left when I produced it about a year ago was thought to be pretty damned good.  The print on the right is from the Kossel, you see a grain effect where the 8 bit controller interpreted steps on the left.  The right print barely shows the steps, you really have to see these to get a full understanding of the increase in resolution in printing.

My other concern was going to be tolerance from machine to machine as I have a few printers now and will be printing multiple parts and in different colours, so things like snap shut lids could be a problem.



Not a worry...  The translucent white print was from another machine over a year ago, and the black section below is a failed print from last night on the Kossel, they are mating parts printed on different machines and the grain in each print is alined, so you can see the difference.  The failed part has the snap lock printed on it, so it makes a good test part.  They clicked together just fine, I am so pleased with the tolerance I am seeing so far.   Yeah other issues with the printer are getting resolved and worked around, but the print quality is just outstanding and it's still early days.

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