I need help splitting an stl file into 2 objects. But its not a simple cut idk if one of you guys knows what to do. I need to split the piece on the inside from the outside because im gonna print it in 2 colors and i need to modify both pieces individually to add the light. Heres the link https://www.myminifactory.com/object/gandalf-the-white-s-staff-17810?storeview=shop
Is your objective to make the inside walls of the item in one color/material, while the outside walls are another color/material? I’ve just now downloaded the model and discovered there’s a torpedo shaped inner portion. I’ll amend my guess to believe that you want to have that portion in a different color/material.
My answer is my usual fall-back program, Meshmixer. I’ve recently started a project that’s a bit more complex than this one and I’m using a rather well written video on the YouTube for doing exactly what you ask, although that inside portion might be a bit challenging to access:
I think you can make this project work using the information from the above video link.
Yeah thats my idea i also need to have that piece cut from the model completely so i can reattach it once both pieces are printed
If you check out the video, you will see that’s exactly what it does, as the objective in the video is the same as your goal.
I hope my laptop can handle it its crappy lol
If you aren’t in a screaming hurry, I may be able to take a shot at it in a day or two.
Nah im not in a hurry. This sculpture im printing seems to be taking a lot of my white filament. Doubt ill have enough for this till next week
It went far easier than I expected, and very quickly. The smaller inside portion has a concave underside, with zero flat surfaces. It would be necessary to add a raft and/or supports.
My slicer (Simplify3D) tells me more than 12 hours to print both pieces.
The concavity bothered me. I’ve jumped back into the project and performed a plane cut. Now the part can be printed flat, no raft, no supports.
I’ve created a Thingiverse remake here:
to hold the files for eternity.
I’ve sliced the outer portion at about the half-way point and included that in the Thingiverse post.
@Fred_U Thanks for the video link. It looks very useful when I get to the point I"m ready to try something in multi-color.
@Fred_U thanx man! I really appreciate you taking the time to help me out. Ill download them when i get off from work and let you know 
ok i downloaded both files, and oh snap now for the big question, will the little piece go inside once printed, i better but some white PETG for the added flexibility lol
@Cristian_Martinez No, it doesn’t look like it will fit. There are three pairs of “fingers” on the top of the big part, and four fingers on the small part and no rotation will allow clearance.
If your printer is too small to print the large piece intact, cutting it in two horizontally with Meshmixer at a suitable location for printing will also give you the ability to place the inner part before re-attaching.
Wonderful idea! I shall try that when i get home!
Note above that I’ve added a Thingiverse link with the outside portion cut in half, plus the other parts, for all to enjoy.
I had not noticed thank you for pointing that out and once again thank you for all the help!
Just a thought, but if you slowed the printing of the outer right down once it’s approx 3/4 printed, you could probably drop the inner piece in, then speed back up? On some printers at least (I couldn’t do that on my Prusa as the head would get in the way, but I could probably do it on my Kossel.)
Or pause the outer print as if doing a filament change, insert the inner, then continue the print.
Or run the fronds of the outer under a scalding hot tap, then slip the inner in whilst the PLA is soft. More hot water afterwards will get the fronds back in position.
Good ideas
@Mark_Wheadon I’ve used the hot water method with reasonable success on other projects.