JGAURORA A3S Reference Model

thingiverse

This (JGAURORA A3S V1 Reference Model 1.0) took about 48 hrs. I assume that we must not infringe on JGAURORA's intellectual property by manufacturing clones of the printer. However, I assume you can use it to: - Make mods. - Re-print or change the included stock-style parts in case they fail or you want to improve them (I made STL files of each) If any stock parts do not have an STL file or they do not fit, please explain the exact problem in a comment, with measurements if possible. See "Print Settings" on this page before printing to try to get it exact! ## Hardware ### JGAURORA A3S V1 - The mainboard says: "MKS Gen L V1.0" - The TFT board says: "MKS TFT28 V3.0" - There is an unoccupied WiFi port. - The serial port is at the bottom middle (and must be disconnected while flashing the mainboard!). ## Measurements The "Measurements" section and subsections apply to the stock parts provided by the manufacturer or exact equivalents. - The blend file uses "left" and "right" to refer to the left and right of the user looking at the front of the 3D printer. - The terms "near and far" are used when looking at the side of the printer to avoid confusion though parts with those labels may be close to each other. - The categories or objects marked "unutilized" are apparently not used from the factory (including the set screw holes on the y axis rail rear mounts!). - The front was perfected by measuring from the screws, measuring to the edge, then measuring the angle (60 degrees). After the (unused) object "body - upper - outer - beveled 16mm before corrected y -4.891" was made, the following changes occurred: The former angle was 122.125 and the measured angle is 120. The scaling values are dependent on the ratios and were obtained by trial and error (typing each digit and backspacing). - Change "Camera at angle..." to the angle corresponding to the measured angle: -60 (formerly 57.875) - Move inward (to shorten body) by global y 4.891 - Move outward by global y -1.0 - scale the front edge ring by y .91949 (actually scaled that one by .9195) - Changes 122.125 to 120 or 57.875 to 60. - scale the next edge ring by y .92343 - The rotation of the mainboard parts are rotated by 2.125 (to 240, formerly 237.875). The margin of error for my measurements is apparently +/- .1mm as far as I can tell. The bottom tapers, perhaps on purpose to be a force fit, or perhaps due to inaccuracy in manufacturing. Therefore, the gantry cutout doesn't visually fit into the slots in the base, but it does in real life since it becomes narrower toward the bottom. The larger depth (global y axis size) is used because the rest of the frame is that size (65.35 mm). - In cases where the factory margin seemed wider or there was uncertainty using digital calipers due to the angle or mechanical tolerances of the calipers (mine have an apparent error rate of about 0.011 on average)), I used the approximate average of multiple points and/or copies of the part or used the nearest measurement that seemed sensible (if the average was close to a round mm figure, nearest quarter mm, or sheet metal gauge). - The shank holes for the z axis motor mounts were incorrect, making the motors stick out by up to ~.84mm below the bottom of the gantry (on the inside part of the bottom-facing face of the left motor). - The motors themselves appear to be 32.35 in height on the z axis. - In the case of the shank holes, modified and corrected shank holes were placed in the model for the z axis motor mounts. - For example, for that shank hole: ~~32.87~~ 32.35 + 2.74 half of screw head width + .84 However, using a theoretical optimal placement is better using the following measurements: 32.35 motor + ~~8~~ 8.15 motor mount = ~~40.5~~ motor mount: ~~8~~ 8.15 (screw hole: 4--assume the tap holes are at the halfway mark for the screws through the gantry) and using the following calculation: ~~40.5 - 8 + 4 = 36.5 center of corrected shank hole from bottom of gantry~~ 32.35 + 8.15 - 4.075 = 36.425 center of corrected shank hole from bottom of gantry (formerly 35.98) - Modding note: To attach a new frame to the bottom of the gantry without modifying the holes, using washers as spacers may be a good idea. - 5mm washers of around .84mm and 4mm washers of around .8mm can be found in NINDEJIN's "304 Stainless Steel Hex Socket Head Cap Screws" kit. Some 4mm ones measure thicker but the flat parts measure around .8 or .85, so after deburring or flattening or filing gently they should be adequate. The 5mm ones seem cleaner but some are thicker (but could be filed or pressed to .84mm). - However, thinner spacers may be better since sticking out by .84 may be caused by bending of the frame as the z motor mounts are thin and only fastened from one side! - The margin of error may be up to .5 in some places where there is no way to measure by touch (when the 3D printer is disassembled into only the 3 major sheetmetal-framed components), but whenever possible, some sort of rod is used to reach. The margin of error may still be up to .5 mm or so when a straight measurement is still not possible other than by aligning the part edge and eye with each caliper edge separately. - Many edges are left sharp, so they are extended to their imaginary (unbeveled) edges, so the margin of error may be greater on parts where that is the only source of measurement such as the screen. - This may not be the case anymore since a straightedge was placed against the surface to visualize the sharp corner. The measurement of the depth of the front to the cut on the y axis is 30 mm and that should be within the tolerance of .1mm (The "body - upper - screen plate + protector" model is now 1.0 (instead of 1.5) so the depth of the part that wraps around is 29. ### Mainboard The mainboard texture is for rough clearances only. The mounting posts are measured according to the usual margin of error. ### TFT Board - The margin of error for the pixels in the texture are significant since the picture was taken at a slight angle then corrected for perspective and aspect ratio. However, if you look closely, you can see that the bottom of each object is nearly pixel perfect. The top is skewed off to the right slightly. This offset is even noticeable on the screw heads. - The center of the bottom screws are 12 mm from the bottom. - The screw spacing from center to center on the x axis is 44 mm. - The screw spacing from center to center on the y axis is 65 mm. ### Sheet metal The sheet metal standards used below are from <https://www.metalsupermarkets.com/sheet-metal-gauge-chart/>. - The sheet metal for the body is modeled as 1.518 since that is the closest gauge (16ga). - The sheet metal for the bed mount assembly and other thin sheet metal parts is modeled as 1.214 since that is the closest gauge (18ga).