MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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Haha, I get you a hundred percent, building machines cost a lot.
Hence why I'm building one out of 20x60 extrusions, cause I I couldn't find 2080 ones, so I have the rear stepper
Peaking out of the back... designing e3d's core xy layout is really hard whitout a custom top plate...
Although it is basicly like the BLV Mgn Cube for instance but with the belt system running under the extrusions to allow to fit the tools in the rear.
Is can you share a bit on how you designed that? For the 20x80 extrusions?

Also as a cheap alternative you can use a 1515 extrusion for the x linear rail supports. The e3d tool changing carriage fits well from my test in gusion.

But really I can't stress enough how much I am loving your take on the toolchanger.
If only I had that kind of money...
Your project is definetly on my watchlist