This print is based on thing:4889265 (https://www.thingiverse.com/thing:4889265), which in turn was based on thing:4311744 (https://www.thingiverse.com/thing:4311744).

Note: this thing is ONLY the case/housing for the brake, which I modified for an easy print, for the rest of the parts, see thing:4889265.

With my Ender 3 Pro, I had issues printing the case/housing with supports from thing:4889265. I know printing it vertically on my printer is not a good options, but if you print it horizontally, then good luck taking the supports out from inside of the housing! So I simply split the case STL file from thing:4889265 into two, to avoid printing with any supports on the inside of the housing.

I dropped both STL files into Cura UltiMaker, and printed them at the same time with supports. I flipped the top part upside down in Cura so that it would sit flat on the bed plate, not requiring additional supports for the area where the limit switch would be attached (I realize I could've done that in OpenScad, too, but I didn't do that). I recommend using higher infill on the shaft and on the end cap from thing:4889265, as the spring may break them over time.

As you can see in the pictures, my print came out ugly, as the parts came partially unstuck from the bed plate during the print, but I did not want to waste more filament to make a "more perfect" print, since this one still works, functionally. Do your Cura magic to ensure it doesn't happen to you -- it's all about how you configure to print on your own printers :-)

Assembly:
• I used glue to hold the handle and the shafter together, and additionally, I used a small screw to ensure they don't come apart, as suggested in thing:4889265. I used the #4 x 1/2" Flat Head 304 Stainless Phillips Head Wood Screw (BCP105) from Amazon: https://www.amazon.com/dp/B07C7LGPWR
• I decided to take an easy approach, and used four zip ties to hold the two halves together once it's fully assembled with all of the pieces.
• For the switch, I used the Limit Switch AC 5A 125 250V SPDT 1NO 1NC Short Straight Hinge Lever Arm Micro Switch KW12 (Type B) from Amazon: https://www.amazon.com/dp/B09SWBYBLX
• Spring: I used some random spring I found in my garage toolbox. It's 11mm in diameter. I cut it to the length I needed for it to fit inside of the housing to hold the end cap and the shaft together.

Thanks to FlightSimMaker who made the original thing:4311744, and thanks to skizzles who made thing:4889265, which I based this thing on.

Enjoy!