Odd printing on certain items!

[PowderLab Drew]

Hi Everyone,

I am having issues ever since I reflashed my firmware. Its driving me crazy, I can print one thing and its PERFECT, I then go to print something else and it looks like the images below!

I have a Rostock Max V2 and am using MatterControl with MatterSlice as the slicer. As far as slicing settings, I am using the ones that SeeMeCnc provided for ABS.

[img]http://imagizer.imageshack.us/v2/150x10 ... BIyiKW.jpg[/img]
[img]http://imagizer.imageshack.us/v2/150x10 ... c2azx9.jpg[/img]
[img]http://imagizer.imageshack.us/v2/150x10 ... vOFtRX.jpg[/img]

I am hoping someone can look at these pictures and know just what the issue is, but as things have gone so far- its never an easy answer.

Andrew

[redlight]

I'm not sure that I can offer much advice, but if some items print correctly and others not, I would try to determine what the common traits are of the objects that failed vs the ones that succeeded.

[PowderLab Drew]

well I tried using Cura to slice it with the exact same settings and it came out WAAAAY better. Not perfect, but totally acceptable.. so strange.

[redlight]

That is strange. From the pictures you posted, I would have guessed that the part shifted during printing. I didn't realize that slicing problems could have caused that.

I'm glad you got it working.

[PowderLab Drew]

I have another issue that I just realized- no matter what I print, it seems like the slot for the fan is too small and I have to file it, or if I printed legs for a tripod it doesn't quite fit...

Well last night my friend printed the exact same file that I did and his tripod legs are half an inch longer and they fit into the hub slot with no friction, mine on the other hand- the legs barely went into the hub.

Is there a setting somewhere that would mess with the dimension settings for the file? It would answer a lot of the issues I am having with fitment!

I am using Mattercontrol with Slicer as the slicer..

Andrew

[Polygonhell]

A number of EEPROM settings affect scale, but you need to know if the error is symmetric, if when commanded to move vertically by 10mm the carriage move 10mm your scale should be correct.
I know the manual suggests using the fan shroud as a test piece, but it's not the best place to start diagnosing print problems, they are much easier to diagnose with simple cylinder and cubes of known dimensions.

[PowderLab Drew]

So I did a 20mm calibration cube and it actually came out 19.33mm!! Its off, but not WAY off... Where in the EEPROM is this issue?

[Polygonhell]

The primary adjustment is steps/mm on the axis, BUT you shouldn't have to touch this, because it's calculated from the belt pitch and pulley teeth.
The Arm length also affects scaling, BUT again you shouldn't have to touch it, and if you do you run the risk if introducing doming issues that result in weird behavior at the edge of the build plate.
Was the error the same in both X/Y and Z, or just X/Y?

[teoman]

I had an awkward problem aswell. I would get % 1 too big on X and Y and % 10 too big on the Z axis.

What I did was flash the rambo and basically start all over again. It could be a calibration issue.


However it is a bastard problem. The worst kind. Sometimes it happens sometimes it doesnt.

[Polygonhell]

If you have an issue where the Z height is incorrect, the attach your EEPROM settings here, I guess it's possible you have bad step values.