doesn't cut into x-axis width (other than e.g. this)
overall minimalist design, keeping things as simple as possible, but not simpler
I generally liked lokster's solution due to compliance with design goal 3, but as some reported problems (comment 1402077 by mcorl) regarding the strength of the cap part, and this improvement conflicted with design goal 3, I moved the reinforcing parts to go inside the right hand z-axis mount. Accordingly I shortened the pulley part, which gave me the opportunity to also make it a bit lighter.
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