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Cura erroneously thinks model is too large to print and refuses to build gcode.


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Posted · Cura erroneously thinks model is too large to print and refuses to build gcode.

This bug appears to have crept-in sometime between 13.10 and 14.01. I used Rep-Host to confirm the tool paths and the following.

My Ultimaker can print over a full 210 mm x 210 mm range in X/Y and I often use all of its potential. When Cura 14.01 Machine Settings are set to 210 x 210, Cura reports that a 209.09 mm x 209.09 mm model (as reported by both Cura and netfabb) is too large. It also complains when the Machine Settings are set to 211 x 211. Settings of 212 x 212 are required before Cura 14.01 will accept my 209.09 mm x 209.09 mm model and build gocde. Cura 13.10 works properly and centers the model when set to 210 x 210.

However, setting the bed width and depth to 212 x 212 in 14.01 does not result in a successful work-around for Cura's spatial pessimism, because the oversize machine settings improperly "bias" the placement of the model in a positive x and y direction and the print cannot centered manually on the bed. It is impossible to locate the model closer than about 1 or 2mm from the X=0 or Y=0 edges. With respect to supporting maximum-size models, it would be nice if 14.01 could be returned to the capabilities of 13.10.

I heuristically (and painstakingly) found that, for my 209.09 mm x 209.09 mm model, a work-around can be realized in 14.01 by enabling the Machine center 0.0 option, setting the bed size to 421x421, and manually moving the placement of the model to the maximum available X/Y location (the upper right corner). Without the use of Rep-Host to check the resulting gcode, this is not a reliable procedure.

Finally, regardless of Cura's intentions to not let me print outside of its calculated box, I'd prefer to be able to override Cura's limiting behavior when models are right at (or just past) the hairy edge of being over-size, because a slight excursion "out of bounds" for a brim can be safely handled by the printer x/y stop switches. In my case, I usually build my own brim and bed adhesion features (and support structures too) into my models, but Cura 14.01 refuses to build 209.09 mm x 209.09 mm gcode at all when set to 210 x 210.


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