BlueROV 2 penetrator tightening tool

thingiverse

TLDR; Print in ABS at 100% infill, I used 0.15 mm layer height. May need scaling to 105% for a good fit. The printer may have been badly adjusted, so I needed to scale the thing up. I attached a locator beacon to our BlueROV 2 and discovered that the tool for tightening the penetrators was missing. It's a tight fit in a cramped space, so a special tool is needed. This is a quick fix, so don't ask me what hex size I've used because I have no idea. I just eyeballed a size that would do the job and tightened it with a sliding wrench. I used calipers to get exact measurements, but suspect that I didn't give the thing enough slack for the old Ultimaker 2's tolerance, so the fit on the penetrator was too tight for the first two prints. The third time's the charm, or so they say. I had to scale it to 105% to get the right fit on the penetrator. I printed the tool in ABS with 100% infill and 0.15 mm layer height. It handled the necessary torque perfectly. I tried making an open-sided version because I suspected an air leak in the new penetrator while vacuum testing after the cables were attached, but opening a wall had a disastrous effect on the integrity of the piece and it broke at low torque. The real problem was the leak in the vacuum hose on my vacuum pump, which was quite annoying.