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limburgmetaal

internal dimentions are wrong

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Not sure what material you are using (different materials have different shrinkage characteristics), so some general things that helped me a lot getting dimensions right (all line widths that I use are the default widths, except for top/bottom which I 'upped' to .4mm:

- print outer wall before inner walls

- print infill before walls

- inset for outer wall .025mm

- get temperature of the nozzle right (too high will introduce minor discrepancies, when dimensions are critical, I use as low temperatures as I can to increase viscosity of the plastic when it's laid down on previous layer. But you have to be careful with lowering the temp since it can have a negative impact on layer bonding. So you will need to experiment with your type of filament to find that sweet spot.

One final thing: please realize that the printer is not printing a pure mathematical circle; instead it mimics a circle by using small lines connecting points on the circle. This also slightly reduces ID's. All things combined can indeed lead to a situation where you have to count these things in while doing the design (make ID's a little larger to obtain the ID you want).

Edit:

Some more ideas that can help improve dimensional accuracy:

- use slower print speeds, especially the speeds on outer walls (don't ruin this by using high inner wall speeds though ;) )

- lower print jerk

Edited by Guest
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