These are replacement knobs that were designed to prevent the bed level from shifting due to inadvertently bumping the stock Ender 3 leveling knobs.
Once the knobs and lock washers are installed the bed can still be adjusted, but the teeth in both the knob and the washer provide a tactile click, and prevent slippage.
If using the "Bed Level Visualizer" plugin for Octoprint (description here: https://plugins.octoprint.org/plugins/bedlevelvisualizer/), each click represents about 0.027mm of bed rise/fall, so about 4 clicks per tenth of a millimeter.
I think these are best printed in PETG as they are more durable, and PETG tends to be a little more slick making the operation of the knobs smoother
The knob contains a cutout for a captive M4 nut that should be inserted mid print at 11.4mm. I used the Prusa ColorChange web app to automate this. That can be found here: https://blog.prusaprinters.org/color-print/
I also, included an additional knob file that is designed to accept a M4 5mm OD heat insert, for those that prefer it. Those inserts can be found here: https://www.amazon.com/uxcell-Knurled-Threaded-Insert-Embedment/dp/B07LBRV259/ref=sr_1_3?keywords=m4%2Bheat%2Binsert&link_code=qs&qid=1570249635&sourceid=Mozilla-search&sr=8-3&th=1
I printed the the knobs separate from the washers at 0.15mm layer height and 50% infill.
The washers were printed ridge side down (tooth side up) and required supports. I did this to maintain the detail of the washer teeth. Printed at 0.15mm layer height and 100% infill.
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