New MK2 : Tree Frog curling  

Re: New MK2 : Tree Frog curling

Usually when I see curling like this, there are 4 possible solutions:

1. Slow down the print
2. Increase cooling
3. Decrease temperature
4. Slice with Z-Lift

However, as this is a pre-sliced model that most of us have printed successfully the solution has to lie elsewhere...

First thing that comes to mind is what filament are you using? The pre-sliced tree frog will usually print fine with Prusa PLA. Other makes of PLA may require lower temperatures. And double-check your fan is blowing onto the part.

Peter

Re: New MK2 : Tree Frog curling

Hi Peter,

I'm using the PLA that came with the kit.
I've tried to slow the print down, via the LCD interface ( 80% ). Could try slower ?
I've also tried turning up the fan to full blast. Didn't really make a difference.

I've also tried re-generating the GCode in simplify3d and played with various options. None successful.
This shouldn't have been necessary as I assume others have printed this successfully with the supplied G-Code.
Also, re-loaded the firmware, and re-downloaded the original samples. Just to be sure.

Also, checked my fan, they are all working.
I'm stumped. 😕

Re: New MK2 : Tree Frog curling

Hi Erwin,

I had a similar problem with no good solution. But a hint.
I guess the problem depends on the form. An overhang.
And the problem is boosted by cooling.

First idea:
Please try to rotate the model by 180°.
The MK2 printhead will blow from the opposite side and perhaps decrease the problem.

Second Idea:
Try turning of cooling. Perhaps this will effect something, hich will guide you in the right direction.

Greetings, Daniel

Re: New MK2 : Tree Frog curling

Hi there Daniel,

I will try turning it 180' tonight.

It is definitely the overhang behind the front feet that is the issue.
But other overhangs and bridges work out great. The whistle as an example.
I haven't tried to print the dragon yet. I assumed if the frog fails then so would the dragon.

What has me stumped is that a stock machine with the stock G-code ( which seems to work for everyone else ), just doesn't work for me.

How big an effect does environmental differences have?
The room where my printer is is quite warm. Between 26 and 30 degrees centigrade.
Also, I'm at 1400m above sea level.
Would this affect it ?

Re: New MK2 : Tree Frog curling

Hi there Daniel,
How big an effect does environmental differences have?
The room where my printer is is quite warm. Between 26 and 30 degrees centigrade.
Also, I'm at 1400m above sea level.
Would this affect it ?

I'm sorry, I really don't know exactly what has to be cool, and what has to be warm. But I have some thougts made some observations.

- a warm environment seems to be good. That's why i'm operating my mk2 inside a cabinet.
- draft is evil. In all case. I causes welding and so the object lift from the bed. Another reason why my printer is in a cabinet 🙂
- I print PLA with cooling. ABS completely without. Because of the same problem like this. I think, that the problem can be reduced without cooling.

It would be nice to know what causes the material to warp up. Especially in areas with overhang. i would really like to know 🙂

Re: New MK2 : Tree Frog curling

It would be nice to know what causes the material to warp up. Especially in areas with overhang. i would really like to know 🙂
ABS warps because of thermal expansion. The object needs to coold down equally in all volume, if possible. So don't use cooling fan while printing from ABS.
PLA warps because it is sticky. It needs to cool down as fast as possible. Using of cooling fan while printing from PLA is highly recommended.

Re: New MK2 : Tree Frog curling

so i'm doing right.

"I print PLA with cooling. ABS completely without."

Thanks for verifying. 🙂

Re: New MK2 : Tree Frog curling

hi,
I have the same problem, even on other models, you have found a solution?
thanks

Re: New MK2 : Tree Frog curling

Can you try the following.

1) Print the Marvin on the SD card.
2) Try a different filament.

Re: New MK2 : Tree Frog curling

I printed marvin and it came out perfectly, the problem happens in objects that have inclined parts beyond a certain angle, like the legs of the frog, without supports

Re: New MK2 : Tree Frog curling

I printed the tree frog 3 times as part of gifts with a non Prusa filament, here was the outcome:

1st time: Full speed, came out perfect.
2cnd attempt: Full speed, layer shift happened when the legs come together with the body, I think.
3rd attempt: Time crunch, printed at 70% speed until the legs met the body, then bumped the speed to 100%. Success.

I've had the same thing happen using the filaments from Prusa for different 3D prints.

For me the variable seems to be printing speed when the 3D object has tricky parts. It would be cool if the slicer could add a beep to your 3D during the tricky parts. Even better would be the ability to slow down the print at certain layers of the 3D object.

Re: New MK2 : Tree Frog curling

I printed the tree frog 3 times as part of gifts with a non Prusa filament, here was the outcome:

1st time: Full speed, came out perfect.
2cnd attempt: Full speed, layer shift happened when the legs come together with the body, I think.
3rd attempt: Time crunch, printed at 70% speed until the legs met the body, then bumped the speed to 100%. Success.

I've had the same thing happen using the filaments from Prusa for different 3D prints.

For me the variable seems to be printing speed when the 3D object has tricky parts. It would be cool if the slicer could add a beep to your 3D during the tricky parts. Even better would be the ability to slow down the print at certain layers of the 3D object.

I have similar issues, and reducing the speed live during print helps.
But I'd really like to know why not everyone seems to have this problem. even you had a successfull first print of the frog, before the fail.

puzzling.

Also would like to know if a modified fan duct could help.

Re: New MK2 : Tree Frog curling

please check out this version.
it takes about 40 minutes to print here, without any modifications of fan duct or else... no messing around with the print speed.
but you need to make sure that your z-live adjustment is right and your PEI-sheet is clean and free of any fingerprints or so.
ps. i use acetone containing nail polish remover for that.

Re: New MK2 : Tree Frog curling

Thanks! I'll print that tomorow, very interested to see if that will curl.

Re: New MK2 : Tree Frog curling

Hi,

I just printed your presliced treefrog, and it printed well, the (overhang) belly is perfect, the only place where I can see slight imperfections is the frogs right leg, where the overhang is. The left one is perfect, the right one still nearly perfect, but there is a visible difference. But that's nitpicking on a very high level.

So. curious. I wonder how David's frog will come out.

Those are steep overhangs and printed fine with the same filament where I have problems with my Slic3r sliced prints.
Maybe I'll try slicing the treefrog with my slicer and settings, and see how that comes out.

Could you give me a rough overview of the S3D settings you used? like speed, layerheight and perimeters? (and what ever else you think is important to get this model right.)

Re: New MK2 : Tree Frog curling

hi marco.v
thank's for the positive feedback.
the gcode was generated with philipp.m's settings that you can find here: http://shop.prusa3d.com/forum/original-prusa-i3-mk2-f23/simplify3d-print-settings-august-30-2016--t938-s100.html#p13314 .

Re: New MK2 : Tree Frog curling

Strangely, I too am just printing a tree frog.

I haven't quite gotten the settings correct yet (and apologies for the poor photo...)

Peter

Re: New MK2 : Tree Frog curling

Strangely, I too am just printing a tree frog.

IMG_20170103_224025.jpg

I haven't quite gotten the settings correct yet (and apologies for the poor photo...)

Peter

You tease!

Curious when I'll get my next package from Prusa 😛

Re: New MK2 : Tree Frog curling

curious, i've seen a two color version of this frog at thingiverse and immediately was tempted to order a multi material kit :D.
but i'm going to wait until the teething problems are sort out.

@peter: is the white box at the right rear of your printbed some kind of waste bin for the filament, when operating with the multi material upgrade ?
does the printer have to change the filament 4 times at every layer ?