This end stop bracket is modified from
https://www.thingiverse.com/thing:602730. It is an end stop bracket for
attaching MakerBot-style end stop switches to 2020 extrusions. It makes
changes intended to solve two problems:

• My end stop switches have seven solder joints on their backs, three of
  which bumped into plastic on all the end stop switch brackets I saw on
  Thingiverse, thus inducing strain and rotating the end-stop switch
  outward. This modified design includes three holes in the bracket to
  accommodate these solder joints, making for a much smoother attachment.

• Other end stop switch bracket designs I've seen provide a screw hole for
  mounting the bracket to the 2020 extrusion that ends up being behind the
  end stop switch itself. This makes it impossible to adjust the placement
  of the switch after it's been installed -- at least, not without removing
  the end stop switch itself. This design moves the mounting screw for
  attaching the bracket to the 2020 extrusion to the side, where it remains
  accessible even after the switch is attached to the bracket.

To use this design, you will need additional parts:

• 2 M3x6 screws to attach the end stop switch to the bracket
• 1 M3x8 screw to attach the bracket to the 2020 extrusion
• 1 M3 T-nut, to which the M3x8 screw attaches

Note that the solder joint holes in this design are highly specific to the
end stop switches I own. The specific products I bought disappeared from my
vendor's site, but I believe they are clones of a MakerBot design. I had no
problems finding similar-looking products on Amazon, but I can't promise the
solder joint holes would match. If you need to adjust their location, you
can do so by editing the Adjustable-End-Stop-Bracket.scad file in OpenSCAD:
Adjust the X positions of the holes by changing the values on line 60, and
change the Z position by altering the "2" value in the "translate" command
on line 61. You'll then need to re-render the design (F6) and export it as
an STL file.

The printer on which I'm using this is a Kossel XL, but the bracket should work fine on any printer that uses 2020 extrusions that should hold end stop brackets.

Robo 3D

R1 ABS + PLA Model

No

No

0.2mm

30%

I printed mine in PETG, but PLA, ABS, or other relatively hard plastics should work fine, too.