Hi! I’m 3d modelling mens shower gel and I can’t figure out how to do details on its sides (they should looks simillar to those on picture attached or maybe with a smoother transition). So far I drew the ouline, pulled it to bottle’s surface and split it but I don’t know how to fill it inside so it blends nicely and is watertight. What’s the best way to do it?
I think you should try project curve, sweep and trim
The “insides” of ribs of products, with some set-back “land”, are often an offset of the outside, so all you need is the outer surface, which you have, and an offset surface further inwards. Quick and dirty, see below. Bodycare products are usually blow-moulded, so I would not bother with constructing the debossing normal to the surfaces, particularly if each rib is filleted.
Debossed ribs.3dm (2.7 MB)
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Thanks, works well!
Blendsrf works well for this type of detailing.
Well, with BlendSrf, you have no control over the initial chamfer’s crown (before the filleting), and you have to herd a large flock of wiggly isoparametric curves ; )
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Is it made like this so it’s easier to remove from the mould?
No, on bodycare bottles, ribs are a styling detail; in case of larger home cleaner or detergent LWBs (lightweight bottles), ribs or chamfers are added for rigidity, stiffness. It’s a bit like with car body panels - if you can design a 5 litre LWB that doesn’t collapse on itself, you can design a car’s hood ; )
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Now tell this to car designers 
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If you want to sketch out soft G2 ribs, you could just do ye olde trim-and-insert thing, then fumble around with a few more CVs for depth and end-cap style.
That’s how you obtain the ribs on the below mouse, for example. Just some good ol’ CV lifting, so to speak.
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Interesting I’ve always wondered why some products look certain ways I know some shapes serve an engineering purpose but never know what for
Now that I started with 3d printing I always study different products how they solved their designs but I never understand why they come to this conclusion that this is the best shape for the product
Like I know in construction triangles and T shapes are strong geometries thats about it
In consumer products and packaging, there’s often a lot of “detail styling”. I’ve never sat in a body or skin care focus group and heard someone clamouring: “Oi, yer bugger! That thing slither’d right out of me hand like an eel!”
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So you telling me admiring the plastic coke bottle design thinking it has some engineering function is just me over thinking it and I need a new hobby?
I think you are right then
A toppklämma is a toppklämma and not a flying fighter jet I knew I was off 
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my guess the detail looks a bit different:
… not my fingernails though …
found the video on amazon
edit:
more like this ? just a fast try…
showerbottledetail.3dm (3.3 MB)
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My 15 minutes. I avoid seams as much as possible by rebuilding curves into splines (or using rounded conic rectangles as this example) and making sure the endpoints are out of the booleans.
GelBottle.3dm (515.7 KB)
- Build the main outline from a rounded rectangle conic corners.
- Rebuild the curve with 80 points.
- Smooth very slightly.
- Extrude to form main body.
- Repeat from the side plan for cut profile: rounded corner rectangle, rebuild, smooth.
- Rotate curve so that seam faces away from body.
- Revolve the profile.
- Array copies.
- Boolean Difference.
- Fillet.
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