I do medically-related printing, currently working on slices through the heart. When the model is relatively small, the slices through the chambers are nice and open. When I increase the size of the model, the slicer adds a covering top layer over the same areas. Anyone know why it happens and how to disable it? Thanks!
Examine your STL (or the source file that’s used to product the STL). You may have a thin wall there. If it’s thickness is less than the layer height, the slicer will skip it. When you scale it up, everything gets bigger including that thin previously-invisible layer and now it’s visible.
You could also turn on variable layer height for the smaller version and if you do, I bet that top layer shows up there, too…
Or rotate your sliced sections 90º so that the top surface is vertical instead of horizontal and it might show up that way, too, depending on your settings for wall generation.
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Thank you so much for the recs! Based on your suggestion, I went back to the original STL of the heart, scaled it up first, then cut it. Sliced perfectly now.