RevarBed
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| Description | Heated Bed Variant
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On my home-brew printer, I have a larger 6" x 7" build platform (about 150 x 175mm), so I had to make my own heated platform. I used the following parts: 6" x 7" x 0.25" aluminum sheet 100W 4" x 5" silicone heater pad, 5 W/in^2, self adhesive backing, 120VAC (part# 35765K181 on McMaster.com, $27) Four #6-32 male-female threaded aluminum hex standoffs (part# 93505A112 on McMaster.com, $0.44 each) 12" x 12" self-adhesive 0.002" thick Kapton Film (part# 2271K72 on McMaster.com, $15.46) Solid State Relay (SSR), 10A 264VAC max out, 5-24VDC in. (part# G3NA-210B-DC5-24 at JameCo.com, $16) 3mm 100K thermistor, (http://store.makerbot.com/electronics/components.html, $5) An AC power cable.
I drilled and tapped four holes in the back of the aluminum plate, and screwed the hex standoffs into it, to use for mounting the heated platform to the X-Y platform. I drilled an additional 1/8" hole in the platform to mount the thermistor into, in the center of the platform. I wired and installed the thermistor, taping it into place with Kapton. The heating pad was adhered the bottom of the aluminum plate, between the standoffs, over the thermistor hole. I used the 4" x 6" heater, but you can get them much larger. I wired the heater pad up to power cord, with the output side of the SSR inline as a switch. The input of the SSR was wired to the extruder controller, to turn it on and off. I cut the Kapton film to size, and adhered it to the top of the platform
Total cost: ~ $66 + the cost of the aluminum sheet and a few wires.
This reaches 110C in about 3 minutes. The Aluminum spreads the heat of the heater pad fairly well, but you may get hot spots if you use the 10W/in^2 heater variant.
