Perfect Circle

[ttam]

Why can't I make a perfect circle?
How can I make a perfect circle?

Thanks!

[Pte Jack]

The more vertexes that make up the ring, the better the Circle.

Shift+A - Mesh - Circle, Increase the vertex count in the Option (bottom Left side of View port)

https://steamcommunity.com/sharedfiles/filedetails/?id=2316934166

Looks like steam is having some graphics problems, it should clear up in a bit.

[The Renderer]

There are multiple ways to make a circle, some more perfect than others. Please specify what you are talking about.

[ttam]

Originally posted by The Renderer:

There are multiple ways to make a circle, some more perfect than others. Please specify what you are talking about.

I am trying to model a circle in Blender to later 3D print.
I need it to be perfectly 55mm and height about 1-2mm.
Pretty small. For a steering wheel

LINK EXAMPLE: https://cdn.shopify.com/s/files/1/1254/3683/products/HCP-6B_1024x1024.jpg?v=1513706577

I created a regular circle in Blender and enabled Measurement Edge Length mode and changed my units to millimeters. The edges weren't perfect, similar to what Pte Jack posted above.
I haven't tried upping the vertices yet, just getting home.

Surely there's a way I can easily create a circle and punch in my measurement sizes right?

[Quantum]

Go to add curve, circle then go to options convert to mesh, tab into edit mode and select all the vertexes and hit F to fill, in the modifiers tab add solidify to desired thickness.

[Pte Jack]

I am finding that is doesn't matter what "units" I use in Blender for 3D printing, they aren't the same when you import it into Ultimaker Cura (or whatever slicer you're using) and I usually have to do 2 or 3 test prints and scale in the slicer to get it right. But that said, using the measurement tool in Blender allows me to make sure the dimensions and spacings are correct. (Measurement tools have to be enabled in Preferences - Addons).

If you need the screw holes like in your picture, your going to have use the knife tools or sub-divides and create a lot of geometry for them to form properly in your print. I would use Bool Tools to pierce the holes into the mesh after sub-dividing.

Something like this...

https://steamcommunity.com/sharedfiles/filedetails/?id=2317363224

[ttam]

Originally posted by Pte Jack:

I am finding that is doesn't matter what "units" I use in Blender for 3D printing, they aren't the same when you import it into Ultimaker Cura (or whatever slicer you're using) and I usually have to do 2 or 3 test prints and scale in the slicer to get it right. But that said, using the measurement tool in Blender allows me to make sure the dimensions and spacings are correct. (Measurement tools have to be enabled in Preferences - Addons).

If you need the screw holes like in your picture, your going to have use the knife tools or sub-divides and create a lot of geometry for them to form properly in your print. I would use Bool Tools to pierce the holes into the mesh after sub-dividing.

Something like this...

https://steamcommunity.com/sharedfiles/filedetails/?id=2317363224

You helped me create my circle now all the vertices are the same size which is great!

Unfortunately I'm not to familiar with Blender's knife and bool tools just yet. My work around is using a cylinder, placing it in/through the object- add modifier- boolean-difference.

I can always drill the holes til I learn to model it out. Watched a video on the knife tool but it didn't help me understand how to cut a perfect hole into an object like you demonstrated in your picture. Your example looks great.

Thank you guys for support!

[Pte Jack]

Yes, you've got the right idea. The cylinder and the boolean cut is probably the best method, but if you want the screw insets you have to go a little bit further.

Create your cylinder to the specifications of the holes, but make it to represent the inset as a separate object and position it where it needs to go.

https://steamcommunity.com/sharedfiles/filedetails/?id=2320970755

Then make duplicates of it for the number of holes you require and position those duplicate by rotating or moving them into the positions they need to be

https://steamcommunity.com/sharedfiles/filedetails/?id=2320977478
https://steamcommunity.com/sharedfiles/filedetails/?id=2320980526

Then Select those objects and join them together into 1 object (Ctrl+J)
This will be the cutter object for the boolean.

Select the Cutter, then the disc and select the Boolean tool and use the cutter as a Difference Brush
https://steamcommunity.com/sharedfiles/filedetails/?id=2320986025

Hide the Cutter, set the Disc object to Smooth Shading and add an edge split Modifier.

https://steamcommunity.com/sharedfiles/filedetails/?id=2320989742

Select the Disc Export SELECTED ONLY as STL and load into your slicer program.