Tree Frog Print Stringy

I am very new to the world of 3D printing and I am looking for advice on how to improve the quality of my prints. I recently assembled a Prusa MK2 successfully (XYZ calibration suggested XY axis was skewed severely however after a few attempts I have not managed to correct this yet). After calibrating my bed height I successfully printed the PRUSA flat logo. I have now moved on to the Tree Frog and by all accounts the print came out well except for a stringy quality left by the hot end moving from one area of the frog to another. Looking through the forums has led me to believe this can be remedied by adjusting "retraction," could someone please walk me through how this is done? Until now I have only been commanding the printer using the LCD and what came on the data card. I printed the Tree Frog using the provided gcode and did not make any adjustments to settings for the printer. I have attached a few images of the final product. Any advice is appreciated!!

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I have the exact same problem. Brand new kit just put together, printing tree frog from the SD card using the PLA supplied with the kit, and it is stringy where it moves across open space. I guess I will try running the STL file through prusacontrol and seeing if that fixes it before moving on to trying to figure out which setting to tweak in slicer... Or should I just skip trying to rerun in prusacontrol and immediately start playing with things in slicer?

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Hi,

I remember my first "half treefrog" that was a disaster (a paw move during the print and i stopped it...).

As you, i think that the gcode on the sd card was good but in fact it wasn't for my printer. I do not know why but as i checked absolutely everything and built a new gcode with my own parameters and solved the problem... so it's the one and only explanation (for me at least)...

First step i downloaded the treefrog stl file and put it in slicer. Then i played with all parameters of the printer (the "advanced > flow > bridge flow ratio" could explain your result). I decrease the movement speed too because i'm not hurry and the result seems to be better.

So try to modify the parameters of the gcode generator software.

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Hi Kris,

are you using PLA filament provided in the kit?

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At least for me, I was using the filament provided in the kit (silver PLA) and got very similar results. I was printing at .05mm per the gcode that came on the SD card. I tried running the STL file through PrusaControl and Slic3r and then tried lowering the hot end temp 5 degrees. I tried changing the retraction to 1.8 and increasing retraction speed to 40. Nothing helped, all prints have stringiness between the toes and between the leg and body of the frog. Any ideas?

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@kuebelhardt @jason

Hi guys,

I've discussed this with our printing specialist. Try to lower hotend temps in two steps, 5 and 10 degrees celcius. Also if possible, try different filament.

Let me know about your progress.

Please use Tree Frog G-code provided by Prusa Research which is tested and tweaked for MK2/S.

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Jakub and Jason,

Yes I was using the PLA that was packaged with my Prusa MK2 kit. I spent a significant amount of time altering the print settings using Slic3r when the provided gcode produced strings and though I was able to improve the quality I could not completely eliminate the issue. Then I tried using Cura with default PLA settings and there was very little to no stringing whatsoever. This got me going down the road of trying different slicing programs and eventually led me to use Simplify3D. I rarely have quality related issues now and I recommend that others with stringing issues try experimenting with different slicers.

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Kris Uebelhardt will be eternally grateful.
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