I didn't use the project planner for a while, an unforgivable mistake:
Whamm, there went another fan...
Short description:
Although the "scene" sort- and placing algorithm takes care about object hits, it completely
ignores their order. At least, not in relation to the size of the printing head.
I didn't test this on my Ultimaker and concentrated on the y-axis, because the crashed machine has
the fan towards y-min.
Maybe that's the reason because it's working for most of us while we're using the Ultimaker?
With the fan on the left side?
My (debug) settings:
xmin 100 ; only to block x-placement
xmax 100 ; only to block x-placement
ymin 50
ymax 1
Try swapping ymin and ymax and look at the gcode output (or put in some debug prints
after sorting completes or the slicer starts to work):
The objects are always sorted in the same (wrong) direction...
Here are my findings, so far.
def setHeadSize(self, xMin, xMax, yMin, yMax, gantryHeight):
self._leftToRight = xMin < xMax
self._frontToBack = yMin < yMax
self._headOffsets[0] = min(xMin, xMax)
self._headOffsets[1] = min(yMin, yMax)
self._gantryHeight = gantryHeight
Ok, a clever solution (except for the overall readability of the algorithm, which got lost without a single comment :wink:
Indeed, if we know the right direction, towards the longer head part, we only need to
store the shorter dimension.
Unfortunately, the "scene sorter"
while len(self._todo) > 0:
n += 1
current = self._todo.pop()
for addIdx in current.todo:
if not self._checkHitFor(addIdx, current.order) and not self._checkBlocks(addIdx, current.todo):
todoList = current.todo[:]
todoList.remove(addIdx)
order = current.order[:] + [addIdx]
if len(todoList) == 0:
self._todo = None
self.order = order
return
self._todo.append(_objectOrder(order, todoList))
self.order = None
only cares about the initially created hit map, created via:
def _checkHit(self, addIdx, idx):
addPos = self._scene._objectList[addIdx].getPosition()
addSize = self._scene._objectList[addIdx].getSize()
pos = self._scene._objectList[idx].getPosition()
size = self._scene._objectList[idx].getSize()
if self._leftToRight:
if addPos[0] - addSize[0] / 2 - self._offset[0] <= pos[0] + size[0] / 2:
return False
else:
if addPos[0] + addSize[0] / 2 + self._offset[0] <= pos[0] - size[0] / 2:
return False
if self._frontToBack:
if addPos[1] - addSize[1] / 2 - self._offset[1] >= pos[1] + size[1] / 2:
return False
else:
if addPos[1] + addSize[1] / 2 + self._offset[1] >= pos[1] - size[1] / 2:
return False
return True
but never about the preferred direction towards the small head dimension.
Until know, I indeed did not manage to find any code that cares about the direction or am I missing something?
I was afraid of touching this hell of a sorter code, so I disabled it and wrote a quick workaround that allows
me to select the order of the objects by simply clicking at them, but that's probably not what you want :wink:)
It really would be nice having this piece of code back and working!
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Daid 298
Odd, there is code in place to account for this "switched around fan" setup. Because, my home printer has this.
I'll do some tests to be sure. See Cura/util/objectScene.py, it has "leftToRight" and "topToBottom" variables that it uses to see if it needs to go in one direction or the other depending on the head size.
I do think 10mm is too little, a normal Ultimaker has ~18mm between the nozzle tip and the end of the head in the shortest direction.
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