Mag Foot for BD-1R Remix (70% scale)

thingiverse

MAG Foot!\r\n\r\nUpdate 2020-01-27: On the original foot, the front toe could only rotate upward 20 degrees. I increased this to 70 so that the foot could be posed more like the fixed piece. However, the hinges couldn't hold the weight and it would flatten out, so I made an object called Foot Strut that holds the foot in a normal-ish position when BD's just hanging out. Finally, I added a v2 saber holder that has two connection points vice one, which is much stronger. Both of these are not designed for magnets, rather a 25.4mmx2mm washer that I could buy locally with a countersunk inner hole.\r\n\r\nDesign goals:\r\n1) Ability to clamp tightly\r\n2) Ability to attach comfortably to shoulder\r\n3) Can still stand on flat surface without issue\r\n4) Can cling securely to metal surface\r\n5) Able to transmit weight of droid into wearer without tendency to slide off their back (need to get resultant force vector of shoulder-top foot to pass through shoulder)\r\n\r\nAfter seeing the amazing leather shoulder strap one person had in a comment (couldn’t find it easily, you should repost here), and the thread with the round circle in the art for his foot, I came up with the idea to build a foot for the droid that had a series of cup magnets mounted in it (props to other person who talked about gluing magnets on the feet, but I also have small ones in my feet already), which could then magnetically anchor itself to a shoulder strap which had metal in it. As a Jedi, I want the magnetism to be functional through two heavy layers of cotton duck cloth, so I went with a “90lb” cup magnet, specifically this one: https://www.amazon.com/gp/product/B081V9XLNF/\r\n\r\nI designed these to use 6-32 x 5/8” flat head machine screws and nylon lock nuts, though 3mm would also work (I’m in the US, so ANSI are much cheaper when I need to go to the hardware store). The files are designed so that you’d pause at the correct layer and put the nuts in using color change feature. The tolerance on the 6-32s is very tight, so if you’re over extruding they might not fit. To solve this you could pause after first hex layer and check hole width, or if you have a MK3 magnetic bed, you can take it off and pound the nuts in with a hammer (make sure you have a well anchored bed on this print!).\r\n\r\nThis actually performed better than expected. The droid with feet is probably pushing 6lbs/2.5kg, and it was able to stick to the side of a refrigerator with only 5 magnets in contact, which allows for additional posing ability (see pic with saber while stuck on fridge). Note that the magnets will not actually attract directly to each other, only 50% overlap. I was planning on putting magnets in the strap as well but ended up using washers (freeing up 4 of the 12 magnets for accessories). \r\n\r\nIf you are printing this on a bigger than 70% droid, I would recommend NOT scaling the whole thing up, just modifying the attachment point. It’s much bigger than the stock foot as the photos show.\r\n\r\nThe strap I made is thin cotton. I put in a few pouches for the droid’s tools and a slot for the washers as well as a piece of 5mm closed cell foam packing material to spread the load. Thingiverse delta buckles for easy adjustment and fixing. I almost went way, way overboard with anchors, but the final attachment will go through a shirt or tabbards etc., so the only need is to have the load taken down to belt, and hold in place while getting dressed.\r\n\r\nFinally, I added the file I used for the saber clip. This will work with an Ultrasaber and is designed to clip around the switch. If this won't work for you, I also put in the file for the magnet that I used, but if you're at this step, you likely have this covered.