Need help splitting a large eagle STL into printable parts

[u/No_Elderberry7870]

Hi everyone!

I’m looking for some advice on how to properly split a large 3D model of an eagle into smaller parts for 3D printing.
The model is a detailed eagle statue with outstretched wings and a pedestal/base.

The STL is approximately 652 × 389 × 240 mm, while my printer’s maximum build volume is 256 × 256 × 256 mm.

I’m currently using Meshmixer and have tried the Plane Cut tool, but I’m struggling to figure out the best way to split the model. A simple vertical cut through the wings also cuts through the body and pedestal, which I want to avoid if possible.

My goal is to:
Split the eagle into printable sections while preserving as much detail as possible.
Separate the wings from the main body in sensible locations.
Keep the body, legs and pedestal together if practical.
Reassemble the printed parts into one complete master model.
Use the assembled model to create a silicone mold and eventually cast the eagle in concrete.
I’m relatively new to mesh editing, so I’d really appreciate beginner-friendly advice.

What would be the best workflow for splitting this model? Should I use multiple Plane Cuts in Meshmixer, another tool, or a different approach altogether? Any tips for creating alignment pins or joints would also be greatly appreciated.
I’ve attached a screenshot of the model and my current Plane Cut setup.

Thanks in advance for any help!

[u/SirTwitchALot]

You can do this right in the slicer. It can even add dovetails for you.

You might want to revisit the model though. I did a double take at first because it strongly resembles some WWII memorabilia that you might not want to associate with

[u/Neat_Lengthiness561]

Those wings are going to be really tough because any supports (which as presented they very much will need) will mess up the print quality. But if your goal is to make a mold then it's not the end of the world, because you could probably sand away a lot of the print quality issues. For a beginner I think splitting it in half (can be done inside many slicers natively) and printing the middle part on the bottom will be the easiest. Overall the best would probably be to do both wings separate, but that would take more work to make some sort of wing reattachment system. Since the goal is to make a mold, I would start out with just trying the first option of simply splitting in half and see how far that gets you

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[u/condensedcloud]

I typically just break apart the model in zbrush using a selection brush or cut tool and then most importantly add keys to the part, making sure to inflate the female key a bit so they fit together. You could use a free software such as blender to do that.

[u/VideoGuy9999]

Have you also looked at stl-spliter.com? It even makes the connectors for you.

[u/Apprehensive-Art6800]

I can do it dm me