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if your 3d printed holes are ugly and stringy
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you are not alone because when I was starting out
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I found it so annoying that any hole that I designed
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for example my counterbore holes for mounting
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where I needed to insert the screws into it
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the print quality would be so bad
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because of the stringing and the inaccuracy of the hole
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that I was wasting so much filament
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and because of that
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I would today like to show you how to fix it
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not only inside of your designing software
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where you truly have the design in your hand
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so you can fully customize it to your case
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but then even a slicer
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trick that can help you quite a lot
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so let's not beat around the bush
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and let's get straight into it
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so once you are inside of your designing software
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in the sketch
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where you have sketched the circles for the holes
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I will call them inner circle and outer circle
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so that I can explain it a bit better
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you will go in the grade section
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and sketch out a rectangle
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so take the rectangle
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and then just place it randomly in there
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and then go in the constrain menu
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pick the Tangent constrain
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and start constraining this circle
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or this rectangle to the circle itself
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and what it creates in the end
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as you can see right over here
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is a square now this is the first one that we need
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and now
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the second one that we need is again a rectangle
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so just start sketching a rectangle
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and then you can again go in the constraint menu
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and now we will need the first two sides
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which is this side and then the side beneath it
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which is this side on the bottom
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to be Tangent again to the same circle
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but not the second one so first
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make these two tangents to the exact same circle
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but now these two side ones
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we need them to be Tangent to this circle
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right over here
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so just make them Tangent there on both sides
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and this is all we need from sketching
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so once you have that you can finish the sketch
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you reveal the sketch and now we will start extruding
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so the first two profiles that we need to extrude
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is the profile that is this one
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right over here
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and then the second one that is this one
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that is exactly the same
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just symmetrically on the other side
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then you will pick in the extrude menu
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you will pick the start from an object
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once you pick the start from an object
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you can select the ring of the hole that is inside
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once you select it
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you are actually starting to extrude from that point on
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and then you can start extruding
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and now this extrusion is really important
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because what you want to extrude is 1 layer height
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so this really depends on what you
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are printing and what you are printing with
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so if you are printing
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for example with 0.2 millimeters of layer height
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you will extrude over here minus 0.2
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but you can always just make this a bit better
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because then it will give you a bit better results
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but it will not to be that dimensionally accurate
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and the geometry will be a bit different
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so either for the most accurate results
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pick the Z minus 0.2 millimeters
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if you are printing with minus 0.2 millimeters
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and if you want a bit better results
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just extrude a bit more so for example
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minus 0.4 so that there are two layer heights
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that the printer can bridge against
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so that's exactly what I will do
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so minus 0.4 and this way
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I cut out two layer heights
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that I will be then printing with
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so once you have this
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you can start doing an another extrude
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and you will pick these four corners
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of the square that we made before
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and you will again in the extrude menu
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you will pick the start from an object
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once you pick that you again select the ring
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so you select the exact same starting point
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and now instead of extruding two layer heights
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you need to extrude double
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so whatever you extruded before
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you will now extrude double
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so for me that's minus 0.8
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I will export it
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and show it to you inside of the slicer
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and so once you import it
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inside of your slicer as you can see from the bottom
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the geometry is a bit different
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and that's exactly what we want
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so let me slice it and once I slice it
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it actually looks completely different
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and what it does right now
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instead of trying to print in the air
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as you can see the first time
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it basically does any geometry of the hole
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it creates just two bridges that are
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from one side to another so
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it never does the part where it would print in the air
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because as you can see
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all it is doing is bridging from one side to the other
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and it never prints in the air
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and that's why this thing completely fixes it
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but now
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I would like to show you even how you can fix it
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most of the time inside of your slicer
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but you have a big less control
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and that's why I don't prefer it
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so as you can see I have this example right over here
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that is that is not with any change of the geometry
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on the bottom
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you're gonna go into quality which is right over here
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you're gonna click on quality
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and then you're gonna scroll down
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and what you're gonna find is the menu called bridging
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which is right over here so once you find bridging
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you will go into bridge counter bore holes
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which is exactly what we're doing
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there are three options either there's none
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which means that it doesn't fix anything
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or there is another option
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which is called partially bridged
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now this is
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exactly what we were trying to attempt to design
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and once you slice the plate
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as you can see
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uh first what it does is it does exactly this bridge
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that's exactly only on the sides as we did
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and then it does the second one
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and because of this it basically fixes it for you
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so you can do it completely in the slicer
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but the problem with this is that for example
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if it doesn't print well it's just a single layer
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and that's exactly what you have the advantage of
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inside of your designing software
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that you otherwise wouldn't be able to do
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inside of the slicer and then there's a third option
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so I believe that the partially breached is really good
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so for example if you don't have any cut knowledge
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it's amazing but
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the third option that I wanna show you
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is something called sacrificial layer
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it seems pretty dramatic but what it basically
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does is that you sacrifice exactly one of the layers
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and it just bridges over the whole layer
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I don't find this to be that good
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because you are trying to do it
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because you're trying to have the whole accurate
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and now they just put like more material in there
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so of course this solves it basically completely
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but again it is not that accurate
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so I don't prefer it
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so I hope that this video was able to help some of you
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as well as it helped me and if you have any feedback
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or even a better way how to solve this
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definitely drop it in the comments
