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I want to print multiple objects in a single G-code file on my Maker Select Plus 3D Printer.

On the Cura "Machine>Machine Settings..." menu, what are the correct settings for "Printer head size" in the upper right quadrant?

My best guess is below:

Machine Settings Dialog

Note 1: I'm particularly concerned that I got the min and max directions correct. For instance, I just swapped my Y min and Y max values because when I tried them the other way, the print head impacted the first object when printing the second.

Note 1.5: I added 10 mm to my settings because I was concerned that Cura wasn't accounting for the width of the raft that I usually use when I print.

Note 2: From what I've read online before posting this question, this printer may be physically the same as the WanHao Duplicator i3.

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2 Answers 2

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TL;DR

The settings that you seem to need can be found here: Print One At a time settings? CURA:

You actually can!

Providing that none of your object is too tall (taller than the Gantry clearance). Also the objects cannot be too close from each other (when you activate the option and move objects on the bed, you see a gray box around them showing this limit).

The reason you cannot use it at the moment is probably because you didn't filled the printer head size parameters (Menu "Machine -> Machine Settings..."). You will have to measure them, but on mine (Australian clone of the i3) I use those values and it works fine:

  • Head size toward X min: 30
  • Head size toward Y min: 70
  • Head size toward X max: 60
  • Head size toward Y max: 50
  • Printer gantry height: 35

Those are "conservative" values (a little bigger than the actual values). It means I'm losing a little bed space, but I prefer that to the risk of having the print head knocking out previous prints if one of the measurements is too low :o).

PS: The option will automatically disable itself if some object dimension are too big to avoid collisions

To be fair, the rest of the thread is people debating whether you can successfully achieve sequential printing, or not, with the Wanhao Duplicator I3.

However, the setting above seem to be the settings that you are looking for. Apart from Head size toward X max, they also correlate, pretty much, to the settings that you have already determined. As the poster notes, their settings are, somewhat, on the conservative side, which would explain the difference.


Extra detail

If this is so that you can achieve sequential printing1, then this may not be suitable for your printer, unfortunately. Sequential printing works best for printers with a long nozzle with nothing (fans, X-axis gantry, etc.) around it, for example a delta printer with a low hanging nozzle would be ideal. Your printer type has a wide head with attachments, as well as an X-axis gantry, and so the clearance is less than that of an (ideal) delta.

See WanHao Duplicator i3 Printer Head Size Settings for Cura for more details.

If you wish to go ahead and still try it, then from the same link:

The way to measure is lower the nozzle to the bed.

Then measure the space taken up around the nozzle by the heater block, fans, mounting, the motor, and finally, the distance between the X axis rods and the bed "WHEN the nozzle is touching the bed".

That gives you some idea of the clearance you have where an ALREADY printed object can exist on the bed and NOT get slammed into the gantry or moving head when printing a second sequential part.

Just a visual with a moving bed printer and it's not promising. Not impossible, but in a 200mm square build area, you might really only get 4 objects at a time in the 4 quadrants.

Even that is height limited because the gantry will slam into it at a certain height.

Maybe some weird staggering pattern.

Also, of use, for obtaining your own measurements, from Ultimaker - Cura 14.07 Printer Head Size:

If I'm not mistaken all measurements are taken from the nozzle tip. So, for the first one, measure the size of your head from the nozzle tip towards the direction in X to where your machine homes.

and

There's a tooltip when you mouse over these settings which describes what they mean.

Gantry height is the vertical clearance between the build plate and your x-y gantry (on the Ultimaker, these are the 6mm shafts which hold the head).

If you print two objects - one after another - then the first object must be shorter in height than the gantry height. Otherwise, the gantry would crash into the first part while printing the second part.

In more detail, paying attention to the placing of the objects can aid with any issues that you have with a low gantry:

If you place multiple parts in a diagonal line across the build-plate so the gantry and head never intersects earlier parts after printing them, you can set the gantry height to an artificially high value, to ignore it, without problems.

I place pieces along a diagonal from right-front to left-rear, to avoid conflict when the head homes after finishing the print. I can fit 3 to 4 small but tall pieces on the build plate that way for sequential printing.

The purpose of these Printer head size settings is to enable Cura to determine the order in which the objects are printed:

... none of those settings are important as long as you only print one STL file at a time. It's when you want to print multiple objects "one at a time" that these numbers have a purpose - it allows Cura to figure out which order to print them in and if it can do them one at a time or if it has to print them all at once.


Footnote

1 Sequential Printing is where one object is completely printed, before moving on to the next object, instead of the usual method of printing all objects simultaneously one layer at a time. This method can give superior quality prints, but not always. The main advantage appears to be reduced "stringing" of filament between objects, and a cleaner surface finish, due to reduced print head movement between objects. The process is detailed in Multi-part printing.

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  • $\begingroup$ Thank you for taking the time to answer my question. Unfortunately, this is not the information that I'm looking for; I saw that post as well before I asked my question. I'm looking for official values from the manufacturer, not measurements -- I already made my own measurements because I can't be sure that the other post has the exact same machine as I. $\endgroup$
    – Gdalya
    May 28, 2017 at 23:56
  • $\begingroup$ @Gdalya - Ok, that's a shame. It is often a good idea to state, in your original post, what research you have already done (with links) to save others duplicating your effort. You best bet, now, would seem to be to contact the manufacturer of your printer and try to get a definitive answer from them. If you do get a reply, could you post an answer with the correct/recommended values and accept your answer? $\endgroup$
    – Greenonline
    May 29, 2017 at 1:25
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Like the OP, I'm confused by this as well. I figured I'd need measurements from the center of the nozzle to the left, right, front, and back of the print head, as well as a height from the print surface to the gantry while the head was homed. I've carefully measured, but things aren't going quite as I expected. In trying to understand this, I see examples like the one here:

  • Head size toward X min: 30
  • Head size toward Y min: 70
  • Head size toward X max: 60
  • Head size toward Y max: 50

How is 70 a minimum and 50 a maximum? What do these numbers really mean?

Also, I see the shading in the slicer (presumably one is a shadow, the middle one is a minimum, and the darker one is a maximum?) and changing my values don't affect these shadows in the way I'd expect.

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  • $\begingroup$ If you have a new question, please ask it by clicking the Ask Question button. Include a link to this question if it helps provide context. - From Review $\endgroup$
    – Caleb
    Jan 21 at 20:58
  • $\begingroup$ Head size toward "X min" means distance from center of nozzle toward the origin of the X-axis. $\endgroup$
    – Gdalya
    Feb 10 at 17:22

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