Hey Developers,
I have a problem about modelling stuff (gun,potion etc.) there are always holes in these models I make, and I wanted to know how to fix this.
Thank you for your help!
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You should use modifier called “Solidfy” or while modeling in “Edit Mode” click CTRL + N to remove normals.
Here is the YouTube video where you can see how to use “Solidfy” modifier.
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This did not help a lot, it did not fix my gun. 
Hey there! It would help us a lot if you could share some pictures of what the models look like in Blender and show us what the issues are in studio.
From what i’m seeing you’re not yet very experienced with the program. In this case i would recommend following a few beginner tutorials to get a better understanding of Blender before importing these models in Studio.
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Yes, I am not that good at modelling, I tried using tutorials but I keep getting holes, any tips if holes happen?
To close holes in meshes you need to create additional polygons. You should be familiar with the process as you’ve been making the shape of the gun and potion already. I would highly recommend following a few step-by-step modeling tutorials before making your own meshes. Most of these videos will cover this subject, and you should have no more issues with it afterwards.
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It’s hard to tell if it’s a flipped normal, or you accidentally dissolved the face in question. If it’s a dissolved face, then you can go into edit mode (tab—>edit mode) and change to edge selection (ctrl-tab >edge) grab an select the edges and on the left most panel there is a button called “Make face” just click that and it should fill in. I dont have blender in front of me, but I am pretty sure those are all the steps. Hope it helps!
The problem, which a lot of modelers face is that the normals aren’t correct. for those that do no know what normals are, they determine the direction of a vertex, face or edge. In this situation, the normals are inversed meaning you need to make them consistent. to do this in blender you need to first select the entire model and press the consistent normals hotkeys which between 2.7 and 2.8:
2.7: Ctrl-N 2.8: Shift-N (Note: you must be in edit mode.)
(Its good practice to also remove overlapping vertices that aren’t being used as well. to do this select the whole model > press “W” > Remove Doubles)
While it’s true that you cannot see inverted normals in Studio, you can see the backside of the faces in his provided image, meaning that backface culling is currently disabled. I can conclude that the holes are a case of missing faces, rather than inverted normals.
Inverted normals just mean that you aren’t capable of viewing the face in that direction however since they’re facing in the opposite direction you will be able to view them on the opposite side. you can replicate this effect in blender by inverting normals and turning on backface culling; In Roblox, backface culling is always enabled and cannot be disabled thus I prove your conclusion incorrect.
That’s what i said. It just depends whether you look at it from a global or local perspective.
OP didn’t refer to the holes caused by backface culling in Studio. He sent an image of a gun asset in Blender that showed holes caused by lack of topology, and exclaimed that he wanted to fix these visible holes.
Im talking in terms of the potion bottle, sorry, you are right about the gun though it is missing faces
Ah yeah, i can see where you’re coming from. Sorry if i sounded too aggressive, was caught in a bad day.