D-3PO

It's got worse too. It seems very random. If I untick the remove empty first layers box it sometimes works, sometimes slices as though on the build plate and sometimes puts the model at a RANDOM height that it wasn't at. I can explain how I did it easily enough but don't really want to go posting my models on here as I am selling some of them. Just try slicing a simple cube model at several random heights above the build place, maybe 5 or 10 times and check each time that the fist layer of that model is at the exact height you placed it at. I bet it works sometimes and not others. If it works for you, I guess it could be something else in the profile I'm using. Is there a way I can save and send you my profile?

Ok. I have unticked that box. Initially, doing so appeared to work. However, now Cura just slices as though the object is on the bed again. So, this IS a bug after all.

Oh ok... maybe it's not a bug then. Where is this? Do I have this turned on?

Thankyou so much. 🙂 This has really helped me. Your first solution is the right one for me. I don't know why I didn't think of it myself as I am always doing this with gcode for my CNC machine. I guess it didn't occur to me to do this as it's not usually something we do with 3D printers ie. re-zero one axis after a print has commenced but it's a great and simple solution until the bug is fixed. I have reported it through the link you sent me. 🙂

Hi, I have recently started to use a work flow of designing 3D objects that are prepared in such a way as to create multicolour prints using a single nozzle printer. The slicing technique to generate such objects requires that some parts be sliced in mid-air above the build plate and not in contact with it. I am having two difficulties: 1. Despite my NOT having 'Automatically Drop models to the build plate' tuned on, Cura slices all parts that are visually floating above the build plate as though they are sat flush with it anyway!!! I don't know why I can turn the setting 'Automatically Drop models to the build plate' on and off or what use it is other than being visually pleasing, if all parts are sliced as though they are sat on the build plate regardless of this setting... 2. Parts which are positioned, floating more than a certain height above the build plate will not slice AT ALL!!!!!!!!!!!! I don't know whether with is a bug or whether these two annoying features have been deliberately invoked by the programmers in order to protect novice 3D print enthusiasts from doing silly things... but the point is, sometimes there is method to people's apparent madness and I ABSOLUTELY NEED to be able to slice things at any point in mid-air and have the height of the first layer be the height of the object above the build plate and NOT the height of the first layer. Is there a setting I am missing? Is this a known bug? Is it deliberate? Is there a way around it? Does anyone know? Any help would be greatly appreciated. Thanks. 🙂