I will buy another 3D printer because I need a bit larger items to print and need heatbed 270x210 So I have few possibility. First to buy ordinary 3D printer with 200x200 heatbed and modify it, change frame and heatbed to get 270x210. [www.ebay.com] Or to buy already 3D printer with heatbed 270x210 [www.ebay.com] Or last one to buy a kit like this [www.ebay.com] and frame separatelly [www.ebay.com] What do you suggest to buy to get good and working 3D printer for a lowest price? That one with heatbed 270x210 have a metal frame, but this doesn't look really firmly and stable for me. https://reprap.org/forum/read.php?406,628155,628155#msg-628155 Mon, 20 Apr 2026 21:45:47 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?406,628155,628879#msg-628879 https://reprap.org/forum/read.php?406,628155,628879#msg-628879
The large bed machine above states it will only heat to 70C so you are limited to PLA. I believe this is a standard machine with longer travel Y rods, a bigger bed top and bigger shape heater. The larger heater is better for even heating evenly than just using the standard square heater with a longer bed surface.
I suspect that if you want to use ABS with a larger bed you will have to run the bed heater off a separate PSU as the control boards wont tolerate the current. There are suggestions on the web that this can be done by using a relay from the current bed connection to the new bed system. This means all the rest of the electronics are standard. But there's little point buying a kit with a heater you wont use.
Since it uses Ally extrusions for the frame of the machine it is easier to extend if you wanted to go larger. Why larger ? because you could have 2 standard bed heaters on a 440mm long bed. (One of my plans). I think there are kits out there that say they have a 400mm bed. I suspect that for a bed of over 270mm you will be looking to build your own which is a different discussion and there are other posts on here relevant to that.

For a bigger machine:- Standard electronics kit (without heater?) + PSU for bed + relay + bed heater (or 2), mechanical kit, your own frame parts and rods and carriage.

Hope this helps]]> MCcarman Prusa i3 and variants Fri, 19 Feb 2016 08:28:36 -0500 https://reprap.org/forum/read.php?406,628155,628740#msg-628740 https://reprap.org/forum/read.php?406,628155,628740#msg-628740 Blisk Prusa i3 and variants Fri, 19 Feb 2016 03:16:19 -0500 https://reprap.org/forum/read.php?406,628155,628293#msg-628293 https://reprap.org/forum/read.php?406,628155,628293#msg-628293 Heating bed takes alot of time for ABS with my printer too and it is 200x200.
I have changed bed for MK3 and it is alot better, withouth a glass!]]> Blisk Prusa i3 and variants Thu, 18 Feb 2016 08:14:18 -0500 https://reprap.org/forum/read.php?406,628155,628263#msg-628263 https://reprap.org/forum/read.php?406,628155,628263#msg-628263 eried Prusa i3 and variants Thu, 18 Feb 2016 07:42:20 -0500 https://reprap.org/forum/read.php?406,628155,628155#msg-628155 https://reprap.org/forum/read.php?406,628155,628155#msg-628155 So I have few possibility.
First to buy ordinary 3D printer with 200x200 heatbed and modify it, change frame and heatbed to get 270x210.
[www.ebay.com]
Or to buy already 3D printer with heatbed 270x210
[www.ebay.com]
Or last one to buy a kit like this
[www.ebay.com]
and frame separatelly
[www.ebay.com]

What do you suggest to buy to get good and working 3D printer for a lowest price?
That one with heatbed 270x210 have a metal frame, but this doesn't look really firmly and stable for me.]]> Blisk Prusa i3 and variants Thu, 18 Feb 2016 04:01:14 -0500