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This section is for questions and advanced guides for BoXZY's 3D print head.

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How can I install a heated bed

Is there a secret 24v or 12 volt place on boxzy for a heated bed.

I would like to improve my prints.

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Hi,

It's not much a of secret place, if you carefully remove the cover on the back of BoXZY you can see the controller board.

Block Image

On the bottom are three screw terminals, 1 for a heated bed and two for extruders. The one on the left labeled HOT BED is the one you are looking for.

Block Image

NOTE: Picture is upside-down so now it's on the right

This is where the bed could be attached.

Changes will also need to be made in the firmware. In the configuration.h, there is a line under the heated bed configuration with a definition for if the printer has a heated bed:

// ############# Heated bed configuration ########################

#define HAVE_HEATED_BED true //set the value to true to enable the heated bed

We are currently working on getting a heated bed on our BoXZY and will be posting a guide and shopping list sometime next week.

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Excellent, I was going to look for such a connection, but hadn't gotten around to it yet. But: how about a thermistor or thermocouple connection? Need that too.... Please be sure to discuss that in the guide you mentioned.

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The connection for the thermistor is also on the board, and it will definitely be in the guide we make. The connector is right above the connector for the hot end thermister for those who want to know now. We already have our bed hooked up and working on BoXZY. We just need to find the best list of parts to make this easy for everyone to do themselves.

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I cannot find a configuration.h file anywhere. Do I need to create one with the Repetier Firmware configuration tool ? If so, I'm not sure I know all the settings to select. (first time noob here...)

I'm sure this will all be explained in the guide when it comes out, but patience has never been my strong point. Ha

I have the heat bed installed and just need to configure the firmware to address it.

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For a very simple solution I cannot recommend this one enough. Stick it on the bottom of your plate, plug it into the 110v power supply and set your temp. Heats the bed to 100c in under a minute.

http://www.amazon.com/KEENOVO-Silicone-P...

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Larry, that is a good find, but I think I am going with the wire the plate solution. A couple of mini-Molex connectors and I can even make it removable without having to worry about ruining the bed and the wiring. I think this will be the approach I take eventually, run the wire through a hole between the controller and the bed. Make sure it doesn't bind.

On the print bed have the heating element/grid and temperature probe attached. That way the printer can monitor the temperature and can adjust it if necessary. Plus, when I want to use it I can just plug it in, and when I am not using it, I can take the bed out of the machine without having to move the wiring in and out all of the time.

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I concur with your choice of heating pads! I got the same one after "optimal sizing" from info I found online. Things online said you need at least 0.6W/cm^2. The main area is right at 400cm^2. So you need at least 240W.

To speed it up, I roughly doubled it to 500W. This 8"x8" pad fits this printer's bed perfectly. I opted for the 110v rather than adding load to my printer's power supply. I'm just setting the temp on the control box, but I may get around to adding a thermistor so that the PC can also record the temp.

I verified the plate temp with my Fluke IR meter and it was about 5 degC less than what the box was reading (i.e. plate vs thermistor point).

This puppy heats up really fast and overall works well. But next time, I would probably drop it to 300-400W range. The 500W heats makes the control work overtime trying to maintain the temp steady causing more fluctuation. A lower wattage pad would take longer to heat up, but I believe it would do a slightly better job in maintaining a steady temp.

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Update: Now that I've added a glass bed to my BoXZY, the 500W heater is no longer overkill. In fact, it's nearly perfect! I'm using a very thick 3/8" or 10mm tempered glass. With it, it takes quite a bit more time to heat up, but once at temp, the 500W heater holds it much closer to target temp than without the loading of the glass.

Printing on glass is the only way to go! I've never seen such perfect layers before adding it. Now being able to print a 0.1mm first layer is "the norm" instead of "the exception".

And I found a perfect piece of glass and clips that allow full range motion on every axis. It's 8" x 8" so it perfectly matches the heater. I do add a 8"x8" layer of kapton tape between the aluminum plate and the glass, but otherwise print directly to glass. Here's links to the glass and large ACCO clips I'm using (and I have a pic in my review of the glass):

http://www.amazon.com/Fab-Glass-Mirror-T...

http://www.amazon.com/ACCO-Binder-Clips-...

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Awesome! Thank you for providing those links, I'm gonna try it out!

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I would recommend using a bed heater that does NOT draw its power form the Boxzy Power supply. Either an external DC supply or an AC - based heater is the only way you should go. The Boxzy power supply really can't handle the extra load that a reasonable bed heater will place on it.

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This totally needs a guide. Where do I even get a heated bed that I can add to Boxzy. I'm still very new to 3D printing, and this is my first such printer.

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They're pretty easy to find -- I've had good luck with ebay, just search for "heat bed" or "PCB heater", and find one that's close to the size of the build platform. There are fancy ones, but the "PCB" ones work well -- basically a circuit board with copper traces running back and forth. You may also want to check out 3dprinting.stackexchange.com for help with more general questions like this -- it's just gone public after a private beta, so response to questions is especially fast.

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We are currently trying to get a heater that fits the aluminum bed BoXZY has now. We will be posting a parts list and guide to make this easy for you to find.

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Nice! Thank you Team BoXZY!

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any update on that parts list GUBotDev ?

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And is that connection a 12 or 24v connection? I have a heated bed and am ready to install, but I need to solder some wires. So before I take apart the Boxzy to get to the controller.

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Heated bed would be so nice! I am guessing that won't happen until after the kickstarter fulfillment is done and the hack packs etc. . . But I could definitely go for a heated bed and a couple of added extruders.

I am looking forward to being able to use the diamond hotend eventually.

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It looks like a 200mmx200mm silicone heater will work with the supplied aluminum printing plate - it will slightly overlap the magnetic washers, but not interfere with the leveling screws/springs.

Not sure if it requires 12V or 24V.

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How is that guide going? I just was about to start designing for this project, but it seems there are many other on the bucket list to go after first if this is something in the works.

Thanks!

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HEATED BED GUIDE IS UP! Let me know what you think. It's just first draft. If I left something out, I'll fix it as soon as I can.

Heated Bed Installation

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can we get a link?

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It's been added to my answer above.

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Jo Ha will be eternally grateful.
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