fix belt support fill and support perimeter speed

src/kiri-mode/fdm/prepare.js

@@ -790,7 +790,7 @@ function slicePrintPath(print, slice, startPoint, offset, output, opt = {}) {
         originCenter = process.outputOriginCenter || bedRound,
         extruder = slice.extruder || 0,
         nozzleSize = process.sliceLineWidth || device.extruders[extruder].extNozzle,
-        firstLayer = opt.first || false,
+        firstLayer = (opt.first || false) && !opt.support,
         thinWall = nozzleSize * (opt.thinWall || 1.75),
         retractDist = opt.retractOver || 2,
         fillMult = opt.mult || process.outputFillMult,

src/kiri-mode/fdm/slice.js

@@ -831,7 +831,8 @@ FDM.slice = function(settings, widget, onupdate, ondone) {
         }
 
         // fill all supports (auto and manual)
-        if (!isBelt && supportDensity) {
+        // if (!isBelt && supportDensity) {
+        if (supportDensity) {
             profileStart("support-fill");
             let promises = false && isConcurrent ? [] : undefined;
             forSlices(0.8, promises ? 0.88 : 0.9, slice => {