Welcome! Log In Create A New Profile

Advanced

Very large heated bed (400x400mm)

Posted by MartinAM 
Very large heated bed (400x400mm)
March 25, 2014 06:26AM
I am currently building 3D printer with a work area of 400x400mm. Printer is designed by me and made using T-slot 5 profiles and ballscrews.

The biggest challenge I have is heated bed. I want to have one like MK3 ALU-Heatbed Dual Power.

Any one know where to buy/custom make so big bed?

Regards,
Martin
Re: Very large heated bed (400x400mm)
March 25, 2014 12:20PM
Easiest way is to use an AC-powered silicone or Kapton heater pad attached to an aluminum plate, controlled with an SSR.

Other options are listed here.


Cameron

Help improve the RepRap wiki!
Just click "Edit" in the top-right corner of the page and start typing.
Anyone can edit the wiki!
Re: Very large heated bed (400x400mm)
March 25, 2014 06:26PM
Get an 18" square ceramic tile for about $10. Get some of the cheap diamond drills and a circular diamond blade for a hand grinder. Drill a row of through holes along two opposite edges about 6mm in from the edge. On one side connect the row of holes with a slot, String nichrome wire back and forth between the rows of holes. Set your glass or another ceramic tile on top of the wires and power it off the mains. If you are worried about a short on the bottom where the wire is in the slots, fill the slots with muffler repair putty. I have the tile but I haven't tried putting it together yet.
Re: Very large heated bed (400x400mm)
March 26, 2014 04:32AM
Quote
NewPerfection
Easiest way is to use an AC-powered silicone or Kapton heater pad attached to an aluminum plate, controlled with an SSR.

Other options are listed here.

You saved my day! Thank you. This looks like a good idea.

I just have to figure out how to connect SSR to Rumba board and I am at home...
Re: Very large heated bed (400x400mm)
March 26, 2014 06:34AM
I found a supplier in China for 24V 400x400mm heated silicone mat.
[www.aliexpress.com]

What do you think?

Edited 1 time(s). Last edit at 03/26/2014 06:34AM by MartinAM.
Re: Very large heated bed (400x400mm)
March 26, 2014 10:22AM
To get the same energy density as a 120W 200x200mm bed with a 400x400mm 24V bed, you'd need a 120W*4/24V=20A supply.

It could work, but switching 4 amps worth of 120VAC might be better
Re: Very large heated bed (400x400mm)
March 26, 2014 11:25PM
Quote
MartinAM
I just have to figure out how to connect SSR to Rumba board and I am at home...

Easy:




Cameron

Help improve the RepRap wiki!
Just click "Edit" in the top-right corner of the page and start typing.
Anyone can edit the wiki!

Re: Very large heated bed (400x400mm)
March 27, 2014 10:22AM
I see DaveX.
So it is better to get e silicone mat for 230V then 24V.

NewPerfection : Thx for schematics.
Re: Very large heated bed (400x400mm)
March 27, 2014 12:39PM
I'd expect that standard higher voltage heating equipment would have more product testing than special-purpose cheap 12 and 24V stuff, but do be careful with the dangerous higher voltages. Make sure its on a GFCI and treat it carefully.

20A at 24V isn't risk-free either.
Re: Very large heated bed (400x400mm)
March 28, 2014 06:21AM
Yes I will do that. on the other hand, my CNC router has 80V 24A..
Sorry, only registered users may post in this forum.

Click here to login