I have constructed a model in 123 D design and obtain the message above (from CURA) when attempting to load into CURA
I am using Ultimaker 2+
The model can be contained in a block about 20mm x 40mm x 30mm (x,y,z) and has a minimum wall thickness of 1mm
although generally 2mm.
I have been unable to find any references to minimum size from on-line manuals etc. so am now trying here for help.
Any advice much appreciated.