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Odd thing happening when scaling up, please take a look

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Hello from a UM newbie!

The story so far:

- I created a 6cm-long "castle" model in Sketchup based on my daughter's requirements...SDB7986.thumb.jpg.86b408f8c79ad80ccc485dc69bee08f3.jpg

- I ran a test print at scale 1:2, and the complete gate was printed (obviously not too well because of the scale but that's not my point here), then tried at normal scale, and the vertical bars of the gate did not print at all!! :shock:


Any ideas?

(I'm using RepG, if that helps...)

Thanks a lot!


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yup welcome to the crazy world of 3d modelling for 3d printing.

I guess the problem is, the geometry of these bars are over lapping of course, so these beautiful intersections in 3d space are being taken as negative zero space by the printer. there for... nothing.

two tips that have helped me before.

(1) try selecting one set of bars, horizontal for example and then move them out away from the other bars, maybe.. 5mm. the little space can help the printer see the definition between all the bars a little better.

(2) can work, print the castle with the opening, then copy and past the gate detail into a new sketch, print them as two seperate parts, i find a lot of the time, when i split complex models into a few core pieces, that makes the whole process easier for the printer.

final tip, try this guy. it is a meshing program for sketchup (free addon)


the idea is maybe for the future the best, taking a model with intersecting geometry and rapping a big plastic bag around it to create one clean mesh. so give that a spin and let us know how you get on.

best wishes.

Ian :D

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