Anycubic i3 Mega TMC2208 Silent Mod

We install TMC2208's into our Anycubic i3 Mega with Ultrabase. You can also do this with TMC2100 and TMC2130, but the TMC2208 requires minimal effort and gives excellent results.

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The Anycubic i3 Mega is a good 3d printer, but like most 3d printers it can be a lot more noisy than you'd want. Noise from a printer comes from two sources: Fans and motors. Since the motor noise isn't constant it is usually the most noticeable. Upgrading the drivers to TMC2208's should make a big difference.

To get an understanding of how much noise the motors make, we first need to baseline the printer when just the fans are running. A max of 67 decibels isn't quiet, but we'll leave the fan noise for a later upgrade.

When printing a fairly easy print, in this case a desk hook, we see decibels peak at over 75. That is definitely loud and has past "irritating" and is halfway towards "unpleasant". Let's get started with this upgrade.

The first thing we need to do is disassemble the printer. Luckily this is pretty straightforward. Just removed the bolts from the sides, slide the base out from the extruder, and then remove the small bolts along the underside edges of the base.

Next we remove the two bolts that hold in the fan and bend the fan bracket back slightly, giving us access to the drivers. We can then remove the 5 drivers from the board, being careful to not bend the pins.

We can then attach the heat-sinks to the back of the TMC2208 drivers and install them in the same location as the original drivers. Be sure to install them in the correct orientation, which for me was having the blue driver pins facing the front of the case.

Next we need to reverse the cable orientation for the motors. Using needle-nose pliers you can pull out the 5 occupied white guide brackets. You can reinstall them backwards if you want, but I chose to leave them out. Then Reconnect the wires with the connectors reversed. Take a picture to reference back to if needed.

Finally, we'll want to calibrate the driver voltages. In reality they should come tuned for 1.2 volts which will work, but most recommend using something a bit lower. I decided to go with .85 volts. There are a few places you can touch to check the voltage, but I found the bottom right hole and the top left ground connector to be easiest. Make sure your voltmeter is set to DC. If the voltage is too high you can loosen the bottom screw slightly, if too low you can tighten it. I used the included non-conductive screwdriver to be safe. Once all 5 drivers are set we can reassemble the printer.

With these new drivers, printing the same part as before, the decibel reading is now peaking at 68, only 1 above the base fan noise and 7x quieter than before. They are definitely not silent, but they are now quiet enough that I don't mind having the printer run in the other room all night. This is what all printers should use from now on, and for $30 it's a great upgrade for the Anycubic i3 Mega.

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