I don't use windows....do you know how to do something similar in FreeCAD?
Stop printing at certain height, but still finish the model normally?
Use a modification cube, with 0% infill, 0 contour . You will have no print inside this cube and the layers before the cube will be considered as top layers.
Here we have my Sport FIshing Benchy scaled to 350mm tall on a printer that is 250mm tall. The Support Blocker is as @Cuq says and configured as a cutting mesh with no walls, no tops/bottoms, ad 0% infill. I went into the machine settings and adjusted the Z(height) of the printer to 400 (or the model won't slice).
When I need to do this I also add 1.75mm diameter cylinders as cutting mesh at the mate line between the two prints. They are typically 12mm long and sunk into the part by 6mm. They can be any diameter that will fit but I just use filament for the locating pins.
When printing the top part of the model it gets sunk into the base as you've been doing, throw out the big block but keep (and do not move) the locating pin cutting meshes.
At assembly, I use a pin drill and clean up the little holes, glue in pieces of filament as locating pins, and then glue the assembly together. The alignment between the parts is real darn close to perfect.
I'm not really splitting parts in half, but I will keep in mind it's possible.
When you split a part like that, do you have any special method to match up the layers exactly? Or do you just use the same mm values for Z-offset of the bottom part, and z-height of the bottom of the support blocker cube?
I use the height. If you locate the cutting mesh an exact distance from the build plate then that's how far you would need to sink the model into the build plate to print the next higher part of the model. Little tricks like that allow you to print large models on relatively small printers. It also allows you to do something like print one part of the model at one layer height, and the other part of the model at a different layer height.
I think it would be a lot easier to use the 'split' option in MS 3d builder (part of windows)
then load the split stl's into cura.
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