X520 Alien Frame GPS Tower
Since I didn't like the fairly flimsy GPS-on-a-stick mounts, and had no special spot to mount them on on this frame in the first place, I decided to make a GPS tower to fit. It will take 2 M3 screws to attach to the existing holes at the back. The tower brings the GPS a good 80mm above the frame, for maximum distance from interference to the magnetometer on it. It fits GPS units with 32mm screw spacing. Use 6-8mm nylon standoffs and 8mm screws for the cover.
The cover holes have a single layer in the holes, this is to allow them to remain sturdy by using bridging while printing, without needing support. Just stick a knife in there and twist it once or twice to clear the hole.
The "short" tower is an older version that has thicker walls and is only 50mm tall. I figured I'd throw it in for people who are fine with a lower tower or no external compass on the GPS.