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QuorXZ: A String-driven, Core XZ 3D Printer

by scottyorr Jul 9, 2015
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Just downloaded the QXZ.zip; looks like the QXZalBedandParts.dxf might be defined incorrectly. Importing in OpenSCAD shows strange cuts.

Yeah, OpenSCAD isn't sure what to do when there aren't only non-contiguous objects. I suggest downloading QCad (free) and opening the DXF with that. That file is set up for laser cutting and getting the most out of a given area of aluminum. My laser-cutter required lead-in for all cuts, and thats why there are the little areas of waste designed in. (Compare the inner parts with the file QXZalParts.dxf - you'll see where the areas of waste are.)

Ah, thank you! I'm in talks with a laser cutting service about having a set of these cut, and I was rather confused.

Would the aluminum parts be able to be printed from PLA (100% infill) instead? Or should I really get them made from aluminum?

The plate behind the hot-end mount should definitely be aluminum. (The bolts that tension the strings are cantilever mounted and I'm pretty sure they would create too much stress for plastic.) The other plates at the ends of the XZ gantry might be OK with plastic, but I don't know how the additional flexibility would affect the print quality.

Oh, I see now! The two plates in QXZalBedandParts are used to stiffen from top + bottom!

...and allow for a heated print platform.

Gotcha; very good! This is my first build (currently printing on a pre-assembled Printrbot play). I'll let you know how things turn out.

I don't know if you ever started this project, but I've completely updated the files (including a complete and accurate bill of materials with links to vendors) over at OpenBuilds.com. There are also very detailed build instructions. See the link in my updated description here.