Duplicator i3 Y Axis Skew Correction

thingiverse

If your prints are skewed when they should be square, it's possible that your X-Y axis isn't perpendicular when viewed from the Z direction. This correction block can fix that issue. Attach it to the smooth rod locks that come with the printer for best results. This mod, combined with Z axis braces, sacrifices a few mm in the Y and Z directions to ensure all three axes are perfectly perpendicular to each other. Once installed, the Y axis belt will be rubbing against itself. The Y Bracket Extension can be used to prevent this issue and also keep the carriage plate from sagging in the middle. Here's what you'll need for the correction block: * 4 M3 x 5mm bolts * 2 M5 nuts (Nylon Lock Nuts are optional) And here's what you'll need for the Y Bracket Extension: * 2 M4 x 20mm bolts Now, let's move on to the installation steps. First, detach the smooth rod locks from the printer and remove them from the smooth rods. Next, use two M3 bolts to attach the correction block to the rod locks. Make sure the head of the bolt doesn't protrude past the face of the correction block. Place the correction block back onto the smooth rods as shown in the example pictures. Then, use two M3 bolts and M3 nuts to attach the correction block to the printer frame as demonstrated in the example pictures. Level and align the smooth rods by following these steps: Requires: * A flat and smooth plate such as a piece of glass or metal * Z axis braces similar to https://www.thingiverse.com/thing:921948 * Square with a wide, flat flange such as a rafter square or a better option: http://www.homedepot.com/p/Husky-Universal-Square-HUS125/203951642 Ensure the smooth rod lock bolt and two correction block bolts are loose enough to allow shifting. Move the headed bed to the front of the printer and lightly tighten the two correction block bolts. Next, move the headed bed to the back of the printer and lightly tighten the two correction block bolts. Remove the heated bed and carriage, leaving the linear bearings on the smooth rods. Place the smooth plate directly onto the smooth rods. Press down on each of the four corners of the plate, directly above the smooth rod. If there is movement, adjust the height of the correction blocks. Move the Z axis up and position the square above the smooth rods, placing it up against the X axis rods. Ensure that the bottom of the square is firm against the smooth plate or Y axis smooth rods. Use a piece of paper to test the gap between the square and the two X axis rods. Adjust the Z axis braces until the gap between the square and the two X axis rods are the same. Move the Z axis down, and when using a square similar to http://www.homedepot.com/p/Husky-Universal-Square-HUS125/203951642, place one of the shorter legs flat against the X axis rods. The long leg should be running parallel to the Y axis rods. Slide the correction blocks left or right until the Y axis smooth rods run parallel to the square. Use calipers to check that the space between the rods are the same along the rods. Check the spacing in the front and back of the printer. If the measurements are within 0.5mm of each other, the rods can be considered aligned. Recheck and/or reiterate the alignment process for better results. Ensure all bolts are tightened. Be careful not to strip the rod lock. Finally, install the Y Bracket Extension to the carriage plate and Y axis belt belt bracket. Print Settings: * Supports: Yes * Infill: 35%+