What are the usual measurements of neodymium magnets for 3D printing?  

RE:

There is no official standard. I use whatever is in my box, or is cheap on ali express/bambu maker supply, and fits in the model.

That being said, 6mm and 10mm diameter disc magnets are quite common in 3d printed projects. There is no real agreement on the thickness of said magnet however. (edit: Make sure the poles of the magnet are located on the flat parts of the disc, you probably don't want it polarized the other way - unless you have a special use case like you are making rotary encoder)

RE: What are the usual measurements of neodymium magnets for 3D printing?

Most commonly used in Prusa projects seems to be N52 20x6x2mm rectangular. They are not easy to find in the US but easier to source in Europe. Next would be 10x2mm round magnets. The popular projects on Printables that require magnets will most likely have been remixed by others to allow for other sizes. 

For neodymium magnets, I always try to get N52 strength.    

RE: What are the usual measurements of neodymium magnets for 3D printing?

Remember that N52 neodymium magnets are strong but have the worst temperature resistance. Above 60 C they can permanently degrade. For anything that might get hot, check the manufacturer's tables. Not sure but there may also be different grades of the same strength. You might have to trade off a small amount of strength for higher temperature resistance. Makes me wonder what type are used in the heat bed!

RE:

Except for the buddy camera magnets (maybe) there is nothing really that should hit 60+. Most of the Printables projects that require magnets are things that stick to the outside of the Core One or are generally out of the way of a heat source. 

Also, latest firmware release seems to force the chamber temperature to cap at 55C. 

The magnetic print bed has been around for a long time now so I assume Prusa thought this through when they added the magnets. 

RE: What are the usual measurements of neodymium magnets for 3D printing?

Another common size is 6x2 mm, which is the standard for the popular Gridfinity system (never understood the appeal of it myself though). I prefer 6x3, which I found easier to source, and holes for 6x3 usually work fine with 6x2 magnets.

RE: What are the usual measurements of neodymium magnets for 3D printing?

The 6x3mm round magnets are also used extensively on the Voron series of printers.  I have used them on all of my Gridfinity stuff for the reasons that you mention.  They seem to be more easily available, and cost the same as the 6x2mm.  I think Zach used the 6x2 in his original spec for Gridfinity because they are a little weaker, and will have less tendency to hold hardware in a GF bin.  I have not really found that to be an issue for me with the 6x3 magnets, and the stronger magnets allow me to use fewer of them in large bins/trays, and still have adequate holding in steel drawers.

Posted by: @foxrun3d

Another common size is 6x2 mm, which is the standard for the popular Gridfinity system (never understood the appeal of it myself though). I prefer 6x3, which I found easier to source, and holes for 6x3 usually work fine with 6x2 magnets.

RE: What are the usual measurements of neodymium magnets for 3D printing?

6x3mm. Can be ordered for extremely cheap from AliExpress, so order a couple hundred and never worry about running out again 😀 

RE: What are the usual measurements of neodymium magnets for 3D printing?

If gridfinity was done again, now that printers actually work, it probably would have used printable fasteners instead of magnets, in a similar manner to how multiboard works (at least today; multiboard will probably have changed everything again by the time you read this; I think multiboard evolves sentience sometime around iteration N, where N is a secret number I am not allowed to reveal).

RE: What are the usual measurements of neodymium magnets for 3D printing?

Thanks!!!

RE: What are the usual measurements of neodymium magnets for 3D printing?

I disagree.  Gridfinity has flaws, but the presence of magnets is not among them.  I would not want the bins/trays/holders to snap into the baseplates with an interference fit.

Posted by: @public-username-required

If gridfinity was done again, now that printers actually work, it probably would have used printable fasteners instead of magnets, in a similar manner to how multiboard works (at least today; multiboard will probably have changed everything again by the time you read this; I think multiboard evolves sentience sometime around iteration N, where N is a secret number I am not allowed to reveal).

RE: What are the usual measurements of neodymium magnets for 3D printing?

Current bins don't really interference fit. They will fall out if not fastened using either printed clips, printed screws, or magnets held in by printed clips or screws.

Multiboard changes a lot, and too quickly.

Posted by: @netpackrat

I disagree.  Gridfinity has flaws, but the presence of magnets is not among them.  I would not want the bins/trays/holders to snap into the baseplates with an interference fit.

RE:

I just ordered a crapton of I think it was 3x2mm magnets off of Walmart for cheap. You don't have to use Amazon or Aliexpress.

Even Ebay works.

And there is also McMaster Carr.

Hobby Lobby has a small selection as well.

RE: What are the usual measurements of neodymium magnets for 3D printing?

Those are US stores, I think? McMaster will ship but it's ridiculous and the other 2 don't exist here.

I like to recommend Ali or Amazon for Printables, as they're available in most places where Printables is. These days I no longer recommend Amazon for political reasons associated with their country of origin. However I am not to tell anyone else to not use it - you must do as you wish.

I would like Printables to sell engineering and maker supply items. Prusa only sells spares for their printers, but it would be convenient if you could just click the BOM on a printables model and be taken directly to a Prusa-branded store where you can purchase a kit of the non-printed parts that it needed. (Some other 3d model sites do this).

Posted by: @shrap-2

I just ordered a crapton of I think it was 3x2mm magnets off of Walmart for cheap. You don't have to use Amazon or Aliexpress. And there is also McMaster Carr. Hobby Lobby has a small selection as well.

RE: What are the usual measurements of neodymium magnets for 3D printing?

If Amazon is off the list for you for "reasons" you probably shouldn't be shopping from AliExpress either.

Just saying.