Magnetic proximity sensor cover/bumper

So, I got a 3D printer a month or two ago (it’s all been such a blur of learning curve since!).

Been wanting to do this for awhile. I have an older Avid pro with the proximity sensors that stick out on each corner and it’s always made me nervous while walking around or giving shop tours.

I played around with various designs which bolted the cover onto either the same bolts that hold on the proximity mount plate, or into the t-slots of the adjacent 4080 extrusions, but I couldn’t come with anything that made it easy to remove for adjustments, or more importantly didn’t require you to loosen bolts that could screw up the adjustments.

Then it dawned on me that the mount plates are steel, and it would be easiest to design a cover with a strong magnet for holding it in place.

I designed it with two recessed holes to fit over the 8mm bolts that hold on the plates. in between those is an embedded “print in place” (ie, NOT glued in) 1/2" x 1/4" 16 lb neodymium magnet.

The key for printing is to either have a non magnetic (ie brass) nozzle installed, or since I didn’t have one, to print the cover with the magnet on the bottom so that is close enough (1 mm thick layer in between) to the build plate so that magnetic attraction of the plate is stronger than any pull from the nozzle.

Pictures below. Let me know if there is any interest in getting the files for these.

The same design works on both the Y axis and X axis (gantry) locations. But of course, you need to mirror the model for various locations.

Printer: Bambu X1C, .4 nozzle, PETG-HF filament.

(some pictures are of the first PLA print, that’s ANOTHER story…)

Good idea! I often complain about how the sensors protrude.

In later modes we went to a cube sensor mounted to the gantry instead to avoid this problem.