Printrbot Simple Metal Heatbed Mod
by in_the_garage, published
I've moved over to YouMagine.com All updates on this design can be found here: https://www.youmagine.com/designs/edit-thing-printrbot-simple-metal-heatbed Thanks.
Designed with a heated platform that matches the maximum build platform and is thermally insulated from the rest of the bot. You can easily reach a max temp of 115- 120C in a few minutes with this design for optimal large part ABS prints.
The stock Printrbot Metal Simple is a fantastic little printer with an exceptional degree of accuracy for its price, I really wouldn't change a thing about it. Recently I had to print a few large flat designs and wanted to try attaching a heat bed to get them perfectly flat.
Print four of these brackets and attach the 6X6 aluminum print bed heatbed and thermistor from http://printrbot.com/ BOM and other details in the instructions.
The ideology of mounting the heat bed on a raised platform design posted here is that you are able to insulate the moving parts from heat, use less power and reach a higher maximum temperature. Your Printrbot Simple Metal can print PLA super flat, and experiment other filaments like ABS and Nylon. If you plan to print with high temperature filaments, I recommend printing these parts in ABS for long term durability.
- WARNING - You must replace the laptop style power source and add your own 12 volt power source with enough amps to run the heated print surface. An ATX power supply that you would find in an old PC tower is a really good option. More details in the instructions.
- 2 each of the provided stl files
- 4 small binder clips 20mm wide
- 4 3mm bolts ~10mm long and nuts
- 6X6 printrbot heat bed PCB from http://printrbot.com/shop/6-6-heated-bed/ or http://3dpaftermarket.bigcartel.com/product/printrbot-metal-bundle (this one includes thermistor)
- printrbot aluminum print bed 6x6 from http://printrbot.com/shop/printrbot-aluminum-6x6-build-platform/,
- thermistor with cable http://printrbot.com/shop/thermistor-with-cable/
- ATX power supply or other 12 volt source capable of running the higher draw of a heat bed. You will need to hack this by re wiring some connectors to make what printrbot calls a "Y" adapter using some of the existing connectors attached to the ATX power supply with a bit of soldering. Here are some directions that should help you rig one up (you will have to make the Y adapter part with the existing connectors that comes with the ATX power supply and jump the green wire so the box will power up) http://help.printrbot.com/Guide/Power+Supply+Cabling/16 Also,this video shows you pretty clearly what the connection looks like and how to rig up a Y adapter https://www.youtube.com/watch?v=bqF0m7xMMms
- Finally you might want some cable wrap to keep the heat bed and thermistor wires neat and tidy.
Assemble as shown in photo, mounting holes in STL file are tight but allow for better self tapping into the plastic. Alternately they could be drilled out a little.
Because of the aluminum heat bed from printrbot you probably won't need to make any changes to your z sensor, so you can easily add or remove the bed without major issues. Remember to do all of your z height calibration with the heat bed at temperature.
I have included a PDF file that shows you where to plug in the heat bed, thermistor cable, and power supply.
Finally, you will want to send the following code to your machine M211 X150 Y150 Z140 to compensate for the decrease in Z travel because of the heat bed thickness then M500 to save and M501 to check your work.