Ridiculously Simple Z-axis Micro-Adjuster
by Georgewchilds, published
This is an adaptation of Makergear's concept for micro-adjusting the z-axis height for a Prusa Mendel. I needed it to be able to adjust the height after I flipped my x-axis here:
See instructions below for a more detailed explanation.
And please forgive the lousy print in the photos, I had some loose bolts on the print bed when I printed it. Of course, it's such a simple part that it doesn't affect the operation of the bolt.
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This part is used to permit the flipped x-axis of a Makergear Prusa Mendel to use the tallest vertical support of the x-axis (moving on the steel rod) to trip the z endstop.
For pictures and full explanation of the ease with which I flipped the x-axis, go here:
For the micro-adjustment, mount an M3 bolt in the hole and turn as needed to adjust the height.
While I adapted this from a fan mount for a Makergear Prusa Mendel with nicely-rounded supports, this same design concept can be applied to any reprap whose x-carriage is symmetric with respect to the support bars. In Makergear's Prusa Mendel x-axis motor mount, there is a place for a screw to make micro-adjustments to the z-axis height and I didn't want to give up that capability when I flipped the x-axis. I could have just hacked the motor mount with a drill, but it would require a super-long screw, and I don't need that!
Instead, I adapted a ridiculously simple mount for a screw that can be turned up and down to adjust the z-axis height with a twist of the nice M3 hex key that came with the kit.
I derived this code from this parametric fan mount on Thingiverse:
Then I lined it up with the z-axis endstop (BTW, if you ever need to adjust your endstop holders, I recommend this excellent parametric OPENSCAD z-axis endstop from Triffid Hunter, also on Thingiverse: http://www.thingiverse.com/thing:13482)
For my Makergear Prusa Mendel, I was able to mount this clip onto the upside-down vertical support when I flipped the x-axis.
I made my mount pretty thick, and I closed the opening a little from the original mount so that the overall friction is increased. The $fn (and the concept) can be adjusted to make any polygon-shaped clip regardless of the x-axis motor mount shape.