MakerBot Cupcake Heated Build Platform v2.0
by MakerBot, published
The major breakthrough on this board is twofold:
1. We use a PCB for both the heater element and the support circuitry.
2. We use a lasercut aluminum heat spreader for uniform temperature.
After a bit of trial and error, we came up with an optimum trace resistance of about 4.5 ohms which gives us a 30 watt heater at 12v. This allows us to get up to 100C pretty easily (under 10 minutes).
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I love how simple this was to assemble, but I have a couple of comments that might make sense for the next revision. Can you countersink the aluminum plate an include M3x16 flat head screws, plus washers and split washers? That's how I ended up modding my HBP. Also, I think a nice change to the PCB would involve changing the 3 pin connector to 0.1" spacing. This way, we can take a 3 pin SIP header and solder it to the board (as well as the power connection, which I think is already 0.1"). Now if a wire ever fails, instead of disassembling everything, you just have to unplug the wire and recrimp new ones. I guess some people hate crimp connectors, but if you have the tools, it's way easier. :)
I taped on double stick carpet tape purchased from Walmart. The tape has a cloth fiber backing. The tape's adhesive melts on the heated build platform and forms a flat sticky surface that the ABS adheres to. There is no problem pulling off any object because the surface is still wet and sticky. The heat keeps it from drying up. After multiple uses the adhesive eventually gets overcooked and dry up. So I just replace it.
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Full instructions are on the MakerBot wiki: wiki.makerbot.com/cchb1
We are also going to try something new with this project. We're going to use our forums for support. Here's the forum for this project: wiki.makerbot.com/forum/t-229036/makerbot-cupcake-heated-build-platform-v2-0#post-731781
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