That tiny bit is significant when tollerances are around. If you have the typical 10 segment decagon, each segment is cutting into the interior of the circle a tiny bit. One factor is the number of lines segments in your circle. 2mm all around the outside path so that the head moves in a 10.4mm radius circle. So for example if you ask for a 10mm diameter hole and your nozzle is. Cura compensates by the radius of your nozzle size so as long as you tell the truth, Cura does the correct thing. I thought the same thing until I looked at the gcode. I assume we are talking about vertical cylindrical holes and not horizontal. Also some people when printing 3mm screw hole print at 3mm knowing it will be too small but then sort of self-tap the screw in there and it comes out great.Īlso vertical holes and horizontal holes may have different issues but I've never printed a critically dimensioned horizontal hole.

If you tend to have holes of similar sizes or slots or lengths, and if you print at consistent temperature and speed, then you will tend to need a consistent correction factor. Then I measure accurately and adjust my model. It's wasteful but I don't print the whole part - just the area with the critical dimension. My outer dimensions also tend to be a bit small but not as bad as the inner dimensions.Īnyway I do the same thing as Bill. It's like you are stretching the plastic around a circle and it pulls in a bit. If you are printing a circle and you are printing fast, I often get a circle smaller than the movement of the print head. 4mm too small.īut this is usually not enough correction.

3d printer with 2024 v slot