Heated bed recommendation in UK please

hackinistrator

cartesian 400x400 ?
don't do it .

at those sizes you better keep the bed stationary - corexy and others .

also note that at this size , if you go for very thick aluminium plate , your heating and cooling time will be very long (in comparison to normal printers) .
too thin and you'll have warping of the bed from the heat .

razrudy

@hackinistrator I already have an Anycubic Chiron...or at least the frame from it and the bed...everything else has been changed.
The bed is really bad (24V heated bed with glass on top) and I want to change it.
If I started this road I will rather go and redesign to a coreXY because I don't like that huge bed moving.
By the time I get all the parts I want to start looking for a bed first and model around this.
Now I am trying to find the best option to transform the cartesian bed to coreXY......not sure what adaptors I will need so there is a lot of research I need to do
I like the idea on using a silicone heated bed at 220V with SSR and thermo fuse and maybe magnetic changeable bed sheets...something like Buildtak system with a 1000W 400x400 silicone heater. At least this is what I found on reprap website and looks like a good option

@razrudy

it is only (currently) max 300x300 but sure it has raw power:
https://e3d-online.com/collections/printer-parts-electrical/products/high-temperature-heated-beds

or you buy 4* of the 200x200

Veti

@razrudy said in Heated bed recommendation in UK please:

400x400 silicone heater.

thats to big, you need space on the sides for the screws.

@Veti said in Heated bed recommendation in UK please:

@razrudy said in Heated bed recommendation in UK please:

400x400 silicone heater.

thats to big, you need space on the sides for the screws.

With such a big heatplate I would rather go with 3 independent z-axis spindles with the newer independent z-levelling algorithm. Therfor you rest the bed on 3 magnetic balls (just like those delta-printers did with their toolboards) because then the heatplate can freely be levelled

-> Just my suggestion... It is sunday so maybe too much time to dream around

Veti

you misunderstood me, you need to attach the bed somehow to a carriage or the frame.
when all is taken up by the heater, you can not attach it

hackinistrator

@LB said in Heated bed recommendation in UK please:

@razrudy

it is only (currently) max 300x300 but sure it has raw power:
https://e3d-online.com/collections/printer-parts-electrical/products/high-temperature-heated-beds

or you buy 4* of the 200x200

i'm using e3d high temp bed . its great , but as you said max size is 300x300 .
i also think its a bit overkill , unless you need to print with the bed at 200c .

did anyone consider sticking silicone heater directly to borosilicate glass ? if you're printing just pla , i think it can be the cheapest option .

@Veti

of course, just wanted to spin it further

razrudy

@Veti
The heater is 400x400 and the build plate 406x406....this will work or I will need more clearance?
This is what I have in my mind at this point and 99.99% I will go coreXY just need to decide if I will have the bed moving down or the Z moving up......I saw at one of the users here ( can't remember his username)
Silicone heater
Flexplate
Standard Surface
PETG Surface

Veti

thats 3mm per side. so no it will not work..

as i written above the right size would be 350x350 for the heater.

razrudy

@LB definitely minimum 3 axis if I will move the bed up and down

By any chance can you please post a link with that magnetic balls?

razrudy

@GTech What thickness on the aluminium plate please?
I can find minimum 5mm only for cast type. Then 6 , 8 and 10mm.

GTech

@razrudy I normally use 8mm at the size we are talking it is already quite a chunck of metal. You might be able to get away with 6mm anything below that makes no sense in my mind.
10mm will work as well, its just heavier and has more thermal mass aka. needs longer to heat and cool. Depends on what you can get you hands on.

As others mentioned mounting that thing is the challange, at 400x400 you will need to somehow compensate for thermal expansion or it will warp no matter how thick the plate is.

Take a look at the HeVORT printer, the guy is on the forum here as well, I think he has a nice way of mounting the bed ... it is just bit overkill . Also take a look at the Jubilee nice bed mounting as well.

On eBay and some stores you can also find silicone blocks and spacers intended for moutng printer beds. They are flexible enough to allow the bed to expand and act as a heat break between the bed and the frame at the same time ... not my first choice but apparently people use them succesfully.

Couple of related notes; You can get silicone heaters with holes in them so you can do the mounting directly under the bed and maximize the print area.

Forget about the Cartisan, 8mm 400x400 should weight something in the 3-4kg range(?) accelerating and decelerating that quickly without loosing steps is a whole different discussion. If you want to go Cartisian your only option is a PCB heater ... Chinese clone of the Prusa Mk42 most likely?

FYI I am just dialing in my new build, bit smaller then yours (300x300 build plate on a 8mm cast aluminium tool plate ~380x350) and with propper mounting there is next to no warping.
I disabled mesh bed compensation, active leveling with three Z screws is enough and I can print right up to the edge with a nice and even first layer.

I would also recommend filafarm

As for the Hevort it has already been concluded that, that is an abortion of a design that merely looks pretty, one that relies far too heavily on the wasteful use of supports and the fact that on the "wobble wings" the only thing retaining the bed structure to the ball screw is magnets, as an abortive attempt to overcome ball screws which are not straight, when the correct engineering solution would be it either straighten the ball screws or buy ones from a reputable source...

razrudy

@CaLviNx
Still waiting for the UK and Europe to clear "the after Brexit custom things". Most of my orders from Europe it says that can't be delivered yet because of the new custom rules between UK and Europe. I will check from tomorrow onwards when most shops will open again after holidays to check what are the updates about.

@razrudy said in Heated bed recommendation in UK please:

@CaLviNx
Still waiting for the UK and Europe to clear "the after Brexit custom things". Most of my orders from Europe it says that can't be delivered yet because of the new custom rules between UK and Europe. I will check from tomorrow onwards when most shops will open again after holidays to check what are the updates about.

That's because most resellers do not wish to endure the headache of filling out the extra customs paperwork, as the UK is now considered a "third" country in the eyes of the EU.

So In effect the British government has gotten its wish, and made Britain into "little Britain" and pushed the UK back around 50 years a very very sad state of affairs

razrudy

@CaLviNx
Tell me about......but honestly I don't want to talk about this on the forum. It's a "complicated" situation and I know that the things will settle soon and everything will be like before.

Just my opinion........

@razrudy said in Heated bed recommendation in UK please:

@LB definitely minimum 3 axis if I will move the bed up and down

By any chance can you please post a link with that magnetic balls?

@GTech

-> I like the way projects like HeVORT and or Jubilee are exploring, also I would rather pull on the thin z-spindle(s) instead of pushing it together for accuracy and of course You would need a stable flat-milled e.g. aluplate of around 6+mm for ca. 350x350 better go 8mm for 400x400 where you attach at the bottom your silicone heater or e3d-heater and on top a FR4-plate or similar. THERE WAS A POST on this forum where somebody had calculated the inherent sag of given metal with FE, just search in the forum for it if you have need, you might ask him politely I am sure he will calc you the correct thickness related to where you place the 3 spheres (for star-centering free-floating of that plate) If I think about it they do not even need to be magnetic if the opposite parts are out of plastic. (I have been buying stuff here for years https://www.reprap.me/ (I am not affiliated to them by any means) but sadly for you at the moment also EU).

Just my 5 cents - do what you understand and makes you happy For most people in a forum like this, something in that ballpark should be accurate enough for 2021 if you do it right

razrudy

After many searches I found that I will need " Aluminium Tooling Plate " is this the right one?
Based on the space I have I decided to go with a 500X500mm ( outer frame 620x640mm ) plate and 400 X 400mm silicone heater. What thickness should I choose? I know...It will be a big challenge going that big...but if I am rebuilding my budget printer at least I am doing something for long run.

jay_s_uk

my 500 x 500 is 10mm thick