JeroenR

Thanks for all the comments and suggestions, very helpful. Indeed the horizontal hole expansion factor is one to the settings that mitigates the problem. What helped me most is to use the Engineering Intent Profile where settings are optimised for precision (Ultimate Support pointed me in that direction: Intent profiles in Ultimaker Cura ). Unfortunately this Cura software option is only enabled when selecting some of the Ultimaker cores and only with Ultimaker filaments, so I had to select other cores, select original Ultimaker filaments and then the Engineering settings became enabled. I saved these settings as a Custom Profile and used this for the print I wanted to make with a different filament. This proved to be almost successful, I had to give it a very small additional HHE adjustment and now the electric motor fits snuggly in its housing. I learned a lot these past few days and once again thank you for your contributions. BR, Jeroen

I find this a patronising response, the difference is far greater than 0.4mm and the fact that other (cheaper) slicer/printer combinations do not suffer from this feature is telling. I would have expected and appreciated from Ultimaker or the moderators a more deliberate and comprehensive response. BR, Jeroen

Hi Doug, I am having exactly the same problem, I am printing a housing for an electric motor. It is essentially a 30x30x45mm block with a cylinder hole with a diameter of 25mm. The print has exactly the correct outer dimensions but the inner cylinder comes out as 24.3mm. The STL file, upon inspection indeed shows 25mm diameter, so it is a slicing or printer settings problem. I have noticed this as well with other cutouts for panel meters, when I measure the size and use that in whatever 3D modeling package, the printed cutout is too small en I have to experimentally adjust until it fits. I do not understand whether this is a cura of printer settings feature. A friend who is printing the same STL files with PrusaSlicer and Prusa does not suffer from this feature, the models come out as per the dimensions in the STL file. I have not been able to fix it to date and appreciate insights from people who may have seen this before and know how to fix. Best regards, Jeroen