M3D Crane Quad Y axis limit switch bracket Upgrade

thingiverse

I recently created and upgraded the bed leveling knobs ( https://www.thingiverse.com/thing:3899055 ) but quickly realized that M3D "dropped the ball" on the stop location used for the Y axis (table) limit which was the very small right rear knob. Since I wanted larger knobs, I now had to re-design how the Y axis limit switch was mounted and utilize a different trigger point. Instead of triggering off of the knob, I decided the stop limit should utilize the actual Y axis carriage. I just had to rotate the switch 90 degrees and mount the micro-switch upside down. Now any knob that will fit can be used. Note (Advanced users can skip): Prior to installing this upgraded switch, look at your Y axis offset. Basically after the second touch of the limit switch, the table travels by the amount of the offset and sets the absolute zero position. Mine was set at 5mm which should be the same for both homey.g and homeall.g and had no need to change (see images above). However you could change these values if you want your switch to be mounted in a different position. If you install this bracket and your offset values are set to 5mm, you can install the bracket so the rear edge of the bracket is 2.5 mm from the rear edge of the extrusion (with cap off) and will get you real close if not spot on. To verify, push table to rear until the switch barely clicks, lower head by manually twisting the z axis ball-screw until close to the table, then measure the distance from the tip center to the front of the table (should be about 7mm). Also note that table dimensions are larger than 230 mm x 230 mm. The diameter for the circuit board mounting holes are 2.5 mm and the OEM screws are 3 mm x 0.5 and I happen to have a 3mm x .5 tap laying around and worked well. I actually already made this bracket out of aluminum on my CNC mill but felt compelled to make a printable version (Tested) since I already made the knobs. I hope others will find this bracket and the knobs as useful as I did.