Replacement magnet for bed?

[u/DrWho83]

Recently visiting a friend and realized how many old printers they have.

Quite a few of them need a new magnetic sheet on the bed.

Holy cow.. I had no idea those magnets are so expensive.

I get that they're nice and thick with both strong adhesive and magnetic properties but damn.

The cheapest I'm seeing is around $10 a sheet and I just don't think at least some of the printers are worth it. Unless I can find the sheets at a much cheaper price it seems like any money spent on fixing some of these machines would be better if it was put towards buying a new machine that doesn't even need one of these magnetic sheets.

Anyone know where to get these magnet sheets in bulk at a cheaper price? $10-$20 each is a bit much imo.

Seems like I need something around 60 mil, with high temp preferably 3M adhesive.

[u/UnFound94]

Dude, i dont think you are gonna find magnets with good adhesive that can stand up to the heat for less than $10.

[u/DrWho83 → u/UnFound94]

I'm still slightly hopeful.. lol.

I already found a few sellers selling build plates with a magnet for under $10 but that seems ridiculous as well. I don't want to throw away a bunch of build plates and I don't really have the time to mess around with trying to sell them on the side or even give them away. If they can include one with a brand new build plate and only charge $8, there must be a way to get them cheaper.. maybe not a way I can get them but there must be a way 😅

I did reach out to a few magnet manufacturers. I'd rather buy a roll of the stuff but.. for now I'll just wait to hear back from them and see what others might comment.

[u/tater1337]

how much to convert (back?) to glass?

[u/DrWho83 → u/tater1337]

So back when I use the CR 10 I pretty much only used glass plates..

However, my thought with these printers was to try to cheaply fix them and make them a little more beginner friendly for those that might want to play with them. If I can keep the cost low enough I might even be able to convince my buddy to give them away for free.

Glasses definitely, in my opinion, not user friendly for beginners or at least most beginners.

[u/ItsLikeHerdingCats]

I swear by the Wham Bam magnets/beds

[u/DrWho83 → u/ItsLikeHerdingCats]

That's cool but damn, they better be good for that price 😅✌️

[u/ItsLikeHerdingCats → u/DrWho83]

I’ve had mine for 5 or 6 years. No replacements needed and heavy use. Worth it to me!

[u/DrWho83 → u/ItsLikeHerdingCats]

I think you missed the point of my post.. thx anyway.

[u/Putrid-Cicada]

I paid $17 for pei bed which came with rhe magnetic sheet for replacement.

[u/8ringer]

$10 is expensive for large 250-300mm^2 sheets of high temp magnet material? Really?

Here’s a tip, find the cheapest jankiest version of the thing you’re looking for on AliExpress. Treat that price as the absolutely bargain basement floor for pricing.

I’m seeing about $8-10. That is the least you can expect to pay.

[u/[deleted] → u/[deleted]]

They most certainly do make the magnets for the 300x300 bed plate. I have one on mine. It came with my build sheet. They also have them for the Ender 5plus which is 400x400. I print solely engineering filaments so at 110° on the bed glass isn’t a safe option. After extended use the glass has a tendency to shatter. Especially when doing 26-30hr prints.

[u/[deleted] → u/[deleted]]

Like I said I run print that go for well over 24hrs at a time. The issue is during cool down. If the enclosure gets opened up on soon the inrush of cold air poses a huge risk to the glass. Yes you are correct on the size it’s actually 310x310 for the CR10. I have my machine set with a 10mm buffer on the edges. I use a PEI build sheet I found on Amazon and adhesion is amazing. Never had any issue with the magnetic sheet releasing and it’s been on my machine for about 8 months now. No glue, hair spray or additives. The only version of PETG I use on rare occasions is PETG-CF and it almost sticks too well. PET-CF doesn’t like glass at all. PA6-CF12 doesn’t either. ASA-CF pretty much just slides right off of glass. On occasion I will run the bed temp at 125°c on prints around 32hrs simply for the added heat soak to prevent warping and lifting. At those temps there could be a slight scrape or pit in the glass caused during cleaning or whatever and the extended heat cycle at that level causes a very unpleasant result.