refactor - introduce config folder, and other misc changes

config/common.scad

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+// Config aggregator
+
+include <./dowel.scad>
+include <./magnet.scad>
+include <./slack.scad>
+include <./printing.scad>
+include <./rackFrame.scad>

config/dowel.scad

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+/*
+  Dowel pin config used in side wall hinge module and side wall
+*/
+
+dowelPinR = 1.5;
+dowelPinH = 10;

config/magnet.scad

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+include <./slack.scad>
+
+// Dimensions for small cylindrical neodymium magnets that I bought off Amazon
+magnetR = 3;
+magnetH = 1.7;
+
+magnetRSlack = 0.1;
+magnetHSlack = 0.05;
+
+magnetRSlacked = magnetR + magnetRSlack;
+magnetHSlacked = magnetH + magnetHSlack;

config/printing.scad

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+
+defaultLayerHeight = 0.3;

config/rackFrame.scad

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+
+// Manually set this variable to toggle rack profile
+profileName = "micro";
+
+
+_profileConfigs = [
+    ["default", [
+      ["maxUnitWidth", 180],
+      ["maxUnitDepth", 180],
+      ["numRailScrews", 18],
+      ["screwDiff", 10],
+      ["mainRailScrewType", "m4"],
+      ["mainRailSideMountScrewType", "m4"],
+      ["rackFrameScrewType", "m3"],
+      ["baseRoundness", 5],
+    ]],
+    ["nano", [
+      ["maxUnitWidth", 105],
+      ["maxUnitDepth", 105],
+      ["numRailScrews", 10]
+    ]],
+    ["micro", [
+      ["maxUnitWidth", 180],
+      ["maxUnitDepth", 180],
+      ["numRailScrews", 18]
+    ]],
+    ["mini", [
+      ["maxUnitWidth", 205],
+      ["maxUnitDepth", 205],
+      ["numRailScrews", 20]
+    ]]
+  ];
+
+function _getConfigValueRaw(profile, varName) = profile[search([varName], profile)[0]][1];
+function _getProfileRaw(profileName) = _profileConfigs[search([profileName], _profileConfigs)[0]][1];
+
+function _getConfigValueOrThrowError(val) = val == undef? assert(false, "blah") 0: val;
+function _getConfigValueOrDefault(val, default) = val == undef? default: val;
+
+function getConfigValue(profile, varName) =
+_getConfigValueOrDefault(
+_getConfigValueRaw(profile, varName),
+_getConfigValueOrThrowError(_getConfigValueRaw(getProfile("default"), varName))
+);
+
+function getProfile(profileName) = _getConfigValueOrThrowError(_getProfileRaw(profileName));
+
+function getConfig(name) = getConfigValue(profile, name);
+
+profile = getProfile(profileName);
+
+// Maximum width for rack-mount units. Change this according your max expected enclosure width.
+// Changing this will directly affect the required build volume.
+maxUnitWidth = getConfig("maxUnitWidth");
+
+// Maximum (recommended) unit depth. There technically isn't a max unit depth because there's no physical bound on
+// how far a rack unit can extrude back. This parameter basically controls the distance between the front of the front
+// rails and the back of the back rails. Changing this will directly affect the required build volume.
+maxUnitDepth = getConfig("maxUnitDepth");
+
+// Vertical distance between the midpoint of adjacent screws mounts. Affects build volume.
+screwDiff = getConfig("screwDiff");
+
+// Number screw slots on the main rail. Affects build volume.
+numRailScrews = getConfig("numRailScrews");
+
+// Screw type used for rackmount units. See screws.scad.
+mainRailScrewType = getConfig("mainRailScrewType");
+
+// Screw type used to affix side rails.
+mainRailSideMountScrewType = getConfig("mainRailSideMountScrewType");
+
+// Screw type used for constructing the actual rack frame.
+rackFrameScrewType = getConfig("rackFrameScrewType");
+// Currently, only m3 screws are supported here (tolerance issues)
+assert(rackFrameScrewType == "m3");
+
+// Fillet radius for main rack profile
+baseRoundness = getConfig("baseRoundness");

config/slack.scad

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+/*
+  Slack config to standardize different usages of slack/tolerance values.
+
+  The purpose of this config is to introduce some consistency with how slack values defined in code. E.g. Why is the
+  slack value defined as 0.3 in this file, but 0.4 in another? This will also allow model-level adjustments for tighter
+  fitting parts, for when it might not convenient to adjust the actual 3d printer (using a 3d printer at a makerspace,
+  for example).
+
+  Some important details:
+    - The general philosophy for slack applications in this project is to subtract space from sockets, while not
+      modifying the plugs. TODO: enforce this
+    - Values are signed. Positive values can be interpreted as how much to remove from the socket along some dimension.
+    - This shouldn't be used to compensate for more serious part shrinkage (> +-0.5mm differences)
+*/
+
+xySlack = 0.3;
+
+radiusXYSlack = xySlack/2;
+
+zSlack = 0.2; // TODO figure out nice default value for this. keep in mind z shrinkage
+
+overhangSlack = 0.4;
+
+supportedOverhangSlack = 0.4;
+
+// special slack cases, change if neccessary
+xBarYBarDovetailSlack = xySlack;