1515 allen key z probe retract riser

I needed a riser to hold the Z probe retract bolt after adding adjustable bed clamps to my printer. The bed rose about 30mm, so the effector could no longer reach the bolt to push the zprobe back in without the hot end hitting the bed. This lets you put the bolt at a higher level.

requires: 2x M3x8 bolts and nuts for mounting
1 longer M3 bolt to act as the adjustable platform for the zprobe to retract against

I made the holes too small initially, so had to ream them out with a drill to ge