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Hi there, my Rostock has been dialed in rather ok. I tried slic3r in the beginning and changed to Kiss later on. I think that Kiss produces better G-Code in most cases. So i modelled and printed a hanger for my bathroom door and it works well. But take a look at its structure. It seems like the layer is oscilating somehow. It is a perfect repeating pattern. Any idea what the reason could be? and . Now yesterday i played with a different ABS plastic (Black one) and i printed out a box. Yeah i know its not perfect, but again i had some repeating patterns that i coudl not find what to do against but they do look different. . Also i recognize that in the beginning the extrusion of the filament seems to be "late" and the some layers look like the flow is to low but i print at rather slow speed and the rest of the layers look right. Any ideas?

What temp are you printing at?

g.

Did it print fine previously or are you still calibrating?

I am not sure about the oscillation but I'll try to help. What firmware are you running, what board version? Also when you assembled the rostock how loose were the arms and ujoints? Was there play, if only one side is attached can the arm fall straight down with only gravity? Also check your belts for wear/rubbing.

With the filament feed there could be a couple of things. Did you calibrate the feed length of the filament e.g. When you send a 10mm extrude command from repetier host does it take 10mm of filament (measured before entering extruder not after). When you setup your extruder tension did you check to see if when feeding it can still pull filament without slipping if you put resistance on the filament entering the extruder? You also don't want to have so much pressure the filament is crushed going through the extruder.

I just looked at an early calibration cube and it had some slight oscillation (not as severe as your picture) and filament starving. I corrected it by adjusted the extruder pressure.

Interesting - I have that issue too on my prusa i2 - but I suspect that's due to Z-wobble which I believe is an issue with most cartesian printers - don't see how it could be an issue with a delta printer...

Can't wait to have plastic flowing so I can have all the fun of calibrating the prints

First of all, thank you for your input. I am in the process of getting better results. Most of the oscillation happend because the ABS plasting was somewhere between 1.55 and 1.65 instead of 1.75 therefore i had some starving in repeating patterns. But one las thing is still not clear to me, right in the beginning it seems to not extrude properly but just the first 1 cm. I sitll try to find the issue. I use the repetier fw. Will report back with some pictures.

Greetings

max

Nice thread title by the way. We should use it for every thread

maxx wrote:between 1.55 and 1.65

This is not soo good and could be (at least a part of) the issue. Mine is between 1.69 and 1.71.

Is this the diameter of the filament prior to entering the extruder? I had seen a similar pattern in my first prints but it was that my extruder was not creating enough friction.

If the diameters are prior to entering the feed extruder you will have a lot of problem correcting as that is a fairly large change in volume.

MorbidSlowBurn wrote:Is this the diameter of the filament prior to entering the extruder? I had seen a similar pattern in my first prints but it was that my extruder was not creating enough friction.

If the diameters are prior to entering the feed extruder you will have a lot of problem correcting as that is a fairly large change in volume.

With the morse code like effect on some layers, it would take a LOT more than that variance to see it, the filament is almost certainly slipping in those places.

Thinking about it again I agree, polygonhell. Most likely filament slip. But the 1.55 to 1.65 diameter does equate to a 10% volume difference when extruding. It may not be as pronounced as the first post but may cause some difficult to trace problems such as incomplete fills.

Just some more feedback. After playing a while i can tell you that most of the issue was because the filament size was configured to be 1.75 but in reality it was below 1.6 sometimes. Slipping was not an issue. But now i have some good results. Look at these pictures. . After printing and No cleanup look at the amazing results. The outside: . Sure there are now very small blobs put hey its amazing! Seems like the correct diameter was the most important change.