It's been a while! I've had a lot going on and had been able to make any meaningful headway, but I've been on a tear the last couple of weeks printing and "engineering", so here we go.
Been hard at work on the shoulders. My cat decided to ride my left bicep like a sled and rode it off my shelf, which snapped it right off the welds. I decided enough was enough and wanted to find a way to make the pauldrons detachable, both for ease of donning/removal and safety. I turned to one of my most trusted friends:
MAGNETS!
These 20mm x 7mm magnets have a 4mm screw hole in the middle, and come with 20mm washers for mounting which are great for saving space. They're listed as 25lb, though I didn't do any scientific testing to verify that. I do know that they're decently strong and perfect for this application.
Using Orca Slicer's Boolean function, I created objects to fill in the geometries between the Titlewave MkVb biceps and the shoulder armor (a similar method I used originally, seen
here and
here). I then split that shape in half and Boolean'd ("Boolean'd"?) out holes for the magnets and screws to fit into. I shoved in some heat set inserts and screwed the washers into the recesses. I had to play around with the tolerance at first to make sure that the two halves could slot in with zero resistance, but minimal play. I settled with 20.5mm holes.
For the left shoulder, with
WandererTJ's SAP/CDO attachment being larger and more top heavy, I used three magnets. I marked those lines because I was playing with the idea of reshaping that mount to make it look more "designed," but I figured it wouldn't be seen, anyway.
The right shoulder - ODST by Titlewave - proved to be more of a challenge. To his credit, he had the forethought to model the matching geometry into the shoulder, but this meant that I couldn't just fudge it from scratch like I did with the left shoulder. There was room for only one magnet at the attachment point, which wasn't going to be enough. I modeled a separate spacer towards the bottom of the bicep for a second magnet, which was far more secure.
Unfortunately I don't have any photos of me with both arms on at the same time, but these'll do for the time being. At the very least, without the shoulders in the way I'm able to put the biceps and torso on unassisted and have a second person attach the shoulders after the fact, which is a huge win.