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Dear Tom, I think that the situation is even better than Michael suggests! I can't advise on the hardware aspects, but I have some knowledge of 3D modelling software that I can share. My apologies if you are already up on the software side of things, if so hopefully others here may benefit. As shown on OctoPrint's download page, it is not only available for the Raspberry Pi but also for many Linux distributions and even Windows/Mac. To test this I installed OctoPrint on a AMD64 virtual machine running plain Debian 10 - who knows why OctoPrint requires a Python library named 'emoji', but it certainly works! The installation succeeded first time and took about half an hour. I don't have a 3D printer to test it with, but the web interface running without error is a good sign. I'll agree that OpenSCAD is an excellent tool for designing models to print. One designs the models with code, which defines shapes and how they interact. So you might start with a cube shape, then define a smaller cube to cut away at the bigger one, thus making a hollow, lid-less box. This can seem a bit counter-intuitive if you are used to point-and-click modelling, but its biggest advantage is that, once you design the model, you can modify parts really easily without starting from scratch: if you have a screw thread subtracted from a shape, then you only need to change a few numbers to make that screw hole a different size. Then there's the elephant in the room: Blender! Blender is certainly bigger than the other options, as it is an entire '3D creation suite' - modelling, rendering, animation etc etc... For just modelling, it is very useful if you want to create curvy objects for which being smooth is more important than being absolutely precise. Upon some inspection, it turns out that Cura is licensed under the LGPL. Ultimately, therefore, you can use an entirely free (libre) 'stack' (OctoPrint, Blender/FreeCAD/OpenSCAD, Cura and Linux) for 3D printing! Best wishes and good luck with your printing, Sebastian Freenode: 'seabass' -- The Mailing List for the Devon & Cornwall LUG https://mailman.dcglug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq