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Order sequence of parts in Cura & UM3 #1849

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engrSM opened this Issue May 19, 2017 · 5 comments

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engrSM commented May 19, 2017

Feature Request: the order sequence of parts would be selectable

I want to print a part using custom-made prime towers. Therefore, I want to print this sequence for each layer:

  1. Prime Tower 1 (with Material 1)
  2. Part (with Material 1)
  3. Prime Tower 2 (with Material 2)
  4. Part (with Material 2)

Using per-model-settings, I can easily set the material. However, Cura insists on printing Prime Tower 2 last.

I can shuffle around the plate while watching the first layer travels to make sure the correct sequence occurs, but ideally the order sequence of parts would be selectable. If more than a couple parts are on the build plate, it is difficult to force a particular order This feature would be especially useful when printing PC with PVA supports because PVA cannot easily be deposited on PC, although PC can be deposited on PVA--therefore, PVA supports can be built from the buildplate, but the PC and PVA nozzles must be primed separately.

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Ghostkeeper commented May 21, 2017

If I recall correctly, Cura has these two requirements for the ordering of objects:

  • Minimise the number of extruder switches.
  • If given the choice with minimised extruder switches, print the objects in the order in which they are loaded into Cura.

I might be wrong though. A lot of this stuff was moved around when we did the multi-threading of CuraEngine because the layer starting position was no longer known.

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engrSM commented May 22, 2017

@Ghostkeeper Thanks for reply. In my experience, however, I saw no difference in the order of printing when I varied the order in which the models were loaded in Cura (2.5.0).

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BagelOrb commented Jul 21, 2017

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BagelOrb commented Jul 21, 2017

implemented this

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Ghostkeeper commented Jul 6, 2018

We discussed this with the Cura team yesterday but we see too many bears on the road. We already have a couple of constraints with the order in which things are printed, such as the Layer Start position and one-at-a-time printing. This would prevent those features from being used and it would be complex to use too. We would not like to implement this.

If a solution can be thought of that is easier on the UX we'll consider that.

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