Alunar XY Axis Alignment braces

thingiverse

The Alunar is a fantastic budget printer, but one thing you need to address is that the XY axis isn't orthogonal and needs to be squared up to get more accurate parts. These parts mount on the front base plate threaded rods (inboard side of the base) and on the z-axis guide rods at the bottom. To align them, use a piece of 5/16-18 all-thread rod cut to 9.5 inches length and then use it to push or pull the X and Y axis into alignment. You'll need to loosen the center nuts on the base threaded rods to let the y-axis move and then re-tighten after it's aligned. To square out the bed, use a 6-inch machinist square with the short side on the X-axis guide rods and slide the y-axis back and forth, checking for parallel clearance to the bed edge throughout the travel. If your bed is crooked, align it to the y-axis first and then repeat the process and adjust the nuts on the new threaded rods equally on both sides (one pushing and one pulling) until it's square. I was able to get a nearly perfect square by visual inspection of the clearance gap and after printing a squaring gauge, it was perfectly square over 150mm run in both X and Y directions. Printer: Alunar Rafts: No Supports: No Resolution: .1mm Infill: 25-40% Notes: Parts aren't dimensionally critical but hole sizes should be 8mm for the Z-axis guide rod mounts; i.e., don't scale it - it's already the proper size. Duplicate and then mirror the left block to produce the right block, see the .txt files for more instructions.