Introduction: Battery Pack for Mobile 3D Printing
Parts You Need
- M3D or Other Low Voltage 3D Printer
- 5 Volt 5 AMP Universal Battery Elimination Circuit for M3D. For other printers see Step 1.
- Battery Monitor Alarm 3 Cell(Sound) or Digital Battery Display
- T Connectors
- ZIPPY Flightmax 5000mAh 3S1P 20C Li-Poly Battery for M3D. For other printers see Step 1.
- 2x 40mm Fans 12v or 6v
- Extra power brick you can remove end from
Total cost under $50(Not Counting Printer)
3D Files to Print
Tools You Need
Heat Shrink Tubing
Drill Gun or Drill Press
Li-Poly Watt Meter
Step 1: Selecting the Proper Electronics
If you are using an M3D Micro you can ignore this step, but it is still very informative!
Info To Collect
- Verify the output and input Voltage and Amperage of your 3D Printers current power supply.
- The location of the positive and negative leads shown on this power supply in the middle right.
What Part of My Plug is Positive?
Using the Ohms setting on your multi-meter determine which wire goes to which part of your plug and mark the appropriately.
When selecting a Universal Battery Elimination Circuit (UBEC) it is important to match the voltage exactly but the amperage can be slightly higher or lower than the listed amperage and you should still be fine. Use the output information to select the proper UBEC. In the case of the M3D a 5 Volt 5 AMP UBEC with an input voltage of 7.2V-21V was selected for the M3D.
Once you have selected the proper UBEC for your project the next step is to select the proper battery or batteries to power it. Your battery choice must conform to the following rules
- Be within the input Voltage of your UBEC
- Have enough capacity to be useful
Using the output voltage and amperage of the UBEC we can calculate how large of a battery we would need to power the 3d printer for 1 hour
Output Watts = output Volts * output Amps
Output Watt Hours = output Watts * (Hours you want the printer to run)
A Batteries Watt Hours is equal to its amp hours times its voltage
mAH / 1000 = Amp Hours
Battery Voltage * Amp Hours = Battery Watt Hours
So an 11.1V 5000 mAH battery will power a printer hooked to a 5V 5A UBEC for about 2.22 Hours
Step 2: Test Your Setup
Instead of soldering a T Connector directly to the battery consider buying a converter cable!
Test Your Setup
Connect your Watt Meter between the battery and your UBEC being careful to verify that positive is connected to positive and negative is connected to negative. Use your volt meter to verify the output voltage of your UBEC before plugging it into your printer.
Step 3: Print Your Enclosure
Step 4: Soldering
- Solder a Switch on the between the Battery and the UBEC along the positive wire
- Solder the Fan Connectors to Input side of the of the UBEC for 12v Fans and the Output Side for 6v Fans.
Step 5: Assembly
- Remove the clips from the end of the fan connectors with a small screw driver and slide the wires through the hole closest to where each fan will mount.
- Push the Power Connector out of the lid hole and reattach the fan connectors.
- Push the Battery Meter into the grooved slot until the lid can easily be closed.
- Push the Switch through the quarter inch hole and secure it with its provided hardware.
- Connect the Battery Meter to the battery and slide the battery into the housing if possible.
- Screw the lid on the enclosure.
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