Kernel Bob 
@3dprinting @Siff @esden The dowels have a small effect on straightness. The parts were pretty good without them.
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@3dprinting @Siff @esden I think I could post just this subassembly to Printables as an (Un)original Prusa Drybox remix. It seems generally useful for people with 5 filaments. (Prusa MMU and 5 head XL, for example.)
It's a minor annoyance that the (Un)original Prusa Drybox was made for six spools. Nobody can use six spools in the Prusa world.
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@3dprinting @Siff @esden Here is the new back beam for the drybox, assembled. The tube holes are not parallel -- they will splay out inside the box and group together where they go through the enclosure wall.
I made the beam in three pieces. I used dowel pins as well as screws and inserts. The dowels aren't for strength so much as for straightness.
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