Transition Tower Too Big

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10 comments

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    Joelito Real

    If you are using Prusa MK3 or MK2.5, you can try P2PP plugin for Slic3r. Purge tower sliced on PP2P plugin is less than a half the size and 1/3 the weight. 

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    Jonny Yeu

    Hey Noah, there's a few things you can do to help reduce the tower size. Looking at your Chroma settings, I would suggest decreasing the Min Density to as low as possible.

    We also have additional strategies to reduce the tower size (http://mm3d.co/filament-waste), but I would recommend increasing your layer height as this will make a big difference in the tower size.

    I would also check that the layer heights are all the same in your slicer settings, especially in the supports z-gaps.

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    Brennan Foo

    The tower is so big that there is definitely something funky with layers going on here. We have seen other cases where supports (especially in Slic3r) have thrown things off, and I think that's what is happening here.

    This was the fix from this thread:

    https://www.facebook.com/groups/mosaic.users/permalink/314319322537976/
    https://www.facebook.com/groups/mosaic.users/permalink/300480047255237/

    ...

    Change your Slic3r PE setting to the following setting to fix the Chroma-Slic3r Support- Transition Tower problem:

    Layer Height: 0.20mm
    First layer Height: 0.20mm
    Contact Z Distance: 0.20mm
    Layer Height Limits
    -Min: 0.20mm
    -Max: 0.201mm
    Enable Detect Bridging Parameters
    Slice Model
    Bridge Flow Ratio: 1 (then slice model again)
    Support Extrusion Width: Nozzle Diameter (then slice model again)

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    Noah Clark

    Thank you all.

    Especially for the settings your gave me Brennan Foo.  this defiantly helped me.

    Though i have to have the density at almost 100% to keep it small.  I am fine with the results but why can't it be a smaller size but not as dense like the canvas slicer makes it?

    also on an unrelated topic where can i find more information about the thick extruded line that it prints on the front of the plate before the actual print?  Whats it called?  I am finding that both slic3r pe and chroma are putting it in (I think) and i need to take one out because both are printing in the exact same area and causing problems.

    Again Thank you everyone.

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    Jonny Yeu

    Hey Noah, great to see that you've been able to reduce the tower size.

    The thick extruded line is the purge sequence and can be found in either the start GCode sequence or is written directly into the firmware. If you don't see any commands in the start GCode sequence that causes this purge, we would suggest marking your filament before a print, measuring how much is used for the firmware purge, then adding this amount to your Chroma profile:

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    Brennan Foo

    FYI Noah, on most prints, I suggest the following settings:

    - Min Tower Density of 5%

    - Max Tower Density of 100%

    On layers where there are no color changes, the tower will only use 5% filament (to keep building up the tower so that the tower is available for purging on higher layers. However, in this case, you use every filament on every single layer which means the tower is used fully on every layer. I think you will see on other prints that the tower will not always be 100% dense.

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    Redemptioner1

    @ Brennan

    Just noting that from my experimentation the transition tower will only use 5% infill on "no colour change" if there is only 2 colours in the model. If you increase to 3 or 4 colours then the minimum infill seems to go to 50%.

    Maybe there is an issue in the application as I can't see why it could not be using the 5% infill for no colour change, 25% for 1 change, 50% for 2, 75% for 3 and 100% for all 4. When you print the 2 colour keychain this works well(5% infill up to first layer change), but print a 3 colour lizard or 4 colour pokemon and it goes back to heavy infill even on no colour change layers. 

     

     

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    Brennan Foo

    @Redemptioner1 - Could you possibly provide a picture of this 50% minimum infill tower?

    To clarify: During a print with 4 color changes, on a layer that uses 4 colors, the tower should have 100% infill (assuming the max density is set to 100%, and the min density is set to 5%). However, in a 4-color print on a layer with 3 colors (only 2 color changes), the tower's infill should be 66.7%. And in a 4-color print on a layer with only 2 colors used (1 color change), the tower's infill should be 33.3%.

    Are you 100% certain that the "50% infill" layer wasn't on a layer with 2 or 3 colors used (on a 4 color model)?

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    Redemptioner1

    As you can see, about 50% transition tower infil when only 1 colour change is happening per layer when using 3 colour model.

     

    I also note it will do a colour change for no reason, so it is doing 2 colours on a layer (lets say yellow and blue), it will finish a half layer of blue, transition on block to yellow and do rest of a layer of yellow (so now back to even top layer), transition on block to blue again (why is it doing another transition when it could keep going with blue), do half the layer in blue, transition to out to yellow and finish layer, transition again back to blue and start new layer….etc

     This means it transitions twice per layer on the transition block when clearly it only needs to do it once, it also should only be doing a sparse 30% infill when it is doing a single colour

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    Brennan Foo

    @Redemptioner1, thanks for clarifying.

    In a 3-color print, there should typically be 2 color changes on any given layer (A to B, B to C, then the next layer up would be C>B then B>A — or C>A then A>B). However, some slicers like Simplify3D are known to create multiple tool changes in the same layer (e.g. A to B, B to A on the same layer in a 2-color object). \

    However, in a 3-color print, if there are two colors used on a layer, then the tower should have 50% infill (since 2 transitions would be 100% infill, 1 transition would be half of that).

    Note that your denominator is not the # of filaments used, but the number of transitions expected on each layer (which is 1 less than the number of filaments used).

    If I'm understanding you correctly, I think you're implying that 1 transition should be 1/3 or 33%.

    Instead, it should be that 1 transition is 1 of 2 expected transitions or 50%.

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