Today I worked on the housing for the filament drive system. Pretty simple really, a couple of 1/8" thick aluminum plates, and some delrin to space them apart. As previously mentioned, the drive roller and larger pulley spin on needle roller bearings against a 1/4" diameter shoulder bolt. The front side of the housing has an adjustable shaft that the idler roller rides on. The idler roller is a bronze bushing with rubber bonded to it.
In this side view you can kind of see how all of the pieces fit together. Although I haven't put power to the stepper yet it seems to have plenty of grip on the PLA that I have. It's really hard to see in these pictures, but the delrin is cut for some pieces of 3/8" PTFE rod that I had from another project. I'll drill them out to provide top and bottom guide tubes for the filament. The bottom tube will extend all the way down into the heatsink.
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