Dear #3DPrint friends, I have a little problem. This is the base of my #NeXT#MegaPixel Display mini (scale 1:2). How would you print such a part on an #FDM printer with minimal support?
@phranck I would print it oriented like the letter V, with a custom support piece modeled in. The support would only touch the outer edges of the ribs; I think the inner curve should bridge fine without support. (If you can share the model I’d be happy to make an attempt at it.)
@phranck Not quite. The only area that needs support in that orientation is the very bottom; the curve will flatten out without it but everything above that is self-supporting.
You can either raise the model a small distance above the bed* and generate supports under it, or (better) you can modify the model by adding a custom support with a .2mm gap between.
@phranck (*in PrusaSlicer, add a 3x3x3 box as a part with z coordinate 1.5mm, and then raise the z-height of the main part by 3mm. I don’t know if it’s the same in Bambu Studio)
@phranck Theoretically, this should be all you need, though the very bottom will end up slightly flattened out. Everything else is a short straight bridge or within the safe range for overhangs.
@phranck Here’s with the 3mm elevation so that there’s room for supports under the full length of the curve. (Note the useless little box that’s just there to fool the slicer into letting the part not touch the bed)
@phranck Yeah it’s annoying, you have to add a dummy part because the slicer insists on the model touching the bed. I don’t know the exact method in Bambu, but try opening the .3mf file I shared.
@dwineman Ah, I got it. In BS I have to add a so called „Primitive" (in this case a little cube). Then these two objects have to be assembled into one objects of multiple parts. Now I can lift my model up. 👍🏼
@phranck
Position it so the ‘triangle top’ points up. Use grid or tree support for the shorter side and angled edges. Everything should print perfectly with minimal support.
Optionally, add pop-off support to the model with print orientation the same way. That might give you cleaner edges.
@phranck The various ribs on NeXT devices are a pain for FDM. If you're willing to tweak the shape a bit, adding fillets and angling the sides of the ribs might do the trick without support. For strength I think you have to print it on its side.
What printer are you using?
@phranck I might try printing the stand separately from the ribs and then glue them together. With the X1C they can be precise and accurate enough to have the seams mostly hidden.
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