Z Axis Optical Fine Adjustment
thingiverse
After creating a custom compact Z axis adjustment, I upgraded Marlin and began utilizing Mesh Bed Leveling. MBL allows for height adjustments above or below Z MIN, which made me concerned about triggering the end stop limit switch beyond its limit. Using an optical sensor enables depth below 0 without causing harm. The knob was created using knurled geometry from the MakerBot Knurled Surface Finishing Library Nut and Bolts. The first photo showcases the optical configuration, while the second photo displays the earlier non-optical version installed on my printer (nearly identical). To prevent screw rotation, I increased the height slightly and added a hex rib inside the upper plastic part for a nylon locknut. A regular 3mm nut is used within the knurled knob. Additionally, a bed leveling spring is installed to maintain pressure. While waiting for my optical end stop to arrive, I completely re-configured my cooling fan and added an experimental yet effective poor man's probe; thus, I haven't utilized this configuration. However, it is mostly a remix of the non-optical version I used for a while with slight hole modifications for the optical board and new blade. You can find the non-optical version here: https://www.thingiverse.com/thing:3490367 or my limit switch supports here: https://www.thingiverse.com/thing:2894364 and my hot bed glass retainers here: https://www.thingiverse.com/thing:2897314 This is the same Bed Leveling Knob I have posted as well.
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