MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

Download Now

Report as inappropriate

I used MK8 gears with a outer diameter of 7mm. I got really good results using 172.50 steps with PLA, ABS, and PETG once spring tension set correctly.

I also had the issue of the one filament being pulled out when the other was being pushed in. If you look at the pendulum I posted it has dimples near the drive gears, however this is for a DyzEnd that I never really got working. What works really well for me was those dimples using super glue + baking soda on the original design, which corrected this in/out issue for me.

I had a lot of issue with the servo and finally resolved by using external +8V power supply. I posted this with some firmware info on the comments below.

The extruder offset that I used the provide the best alignment was:
Extruder 1:
X: 9.5
Y: 1.25
Extruder 2:
X: -9.5
Y: -1.25

Hope that helps.