Interesting that they have a smaller motor for Y. My original Printrbot Simple had three small motors and one large motor. If you look at my construction motors, you can see that all three of my tower motors are the small ones.
I have another Printrbot Simple hard-ware only kit I got so I could build another printer (this one laser-cut acrylic), so I'll do some experiments. I'm thinking that with a geared extruder it might be possible to user the small motor for the extruder so you can use the three larger motors for the towers. I'll also check the fit of the larger motors for the towers. I want to replace my printed spools with the metal ones from Tridprinting.com, so we'll see how that works out as well.
I have another Printrbot Simple hard-ware only kit I got so I could build another printer (this one laser-cut acrylic), so I'll do some experiments. I'm thinking that with a geared extruder it might be possible to user the small motor for the extruder so you can use the three larger motors for the towers. I'll also check the fit of the larger motors for the towers. I want to replace my printed spools with the metal ones from Tridprinting.com, so we'll see how that works out as well.