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Since my last update, I have printed the rear section of Four-Nines' head. There's a bit of underextrusion on that print that I still need to fill. I think it was caused by leftover silver PETG.
Having put the head together, I think my droid's eye surround is a bit small ... in some shots it seems to cover maybe a 70-90 degree section of the head (guesstimating that mine's more like 40-50). But I might change my mind once I see it on the body, and I'm not reprinting it at this stage ...
... because I've already hot glued all of the washers to the inside of both hemispheres, as depicted in the last post. I've achieved pretty good coverage of metal on the inside with this process. I went through an entire box of 100 1/4" washers, as well as some from a second box. I also picked up a small number of #8 and #10 washers to use to fill in a few smaller gaps in the coverage.
I've also test fit the halves together. Note that you have to be careful the washers don't protrude much above the edge of their hemisphere, as any that do will strike the four arms as you screw the parts together. Mine do protrude a little, but not enough to be a problem.
I've tested this arrangement with one of my magnets, and even through the 5mm thick plastic of the head AND the plastic the magnet was housed in AND a small air gap, the magnet still had a decent pull on the head. It's hardly enough to lift the head by itself, given all the extra mass of those washers, but once all three magnets are in place it should help keep the head tight enough to get traction on the rotation wheel. Especially given the magnets will be below the head so gravity will be assisting.
The magnets make the rotation ever so slightly "jumpy" rather than perfectly smooth, since they prefer to maximize the amount of metal centered in their field, but I don't think it's much of an issue.
I also broke out my resin printer and printed out some parts.
Lenses ... LD-F1 on the left, Four-Nines on the right.
![[Image: 20220727_051346-smaller.jpg]](http://www.niflheim.net/droidbuilding/images/four-nines/20220727_051346-smaller.jpg)
Four-Nines' lens in situ. Note the camera is making the eye area appear larger than it does to the naked eye:
![[Image: 20220727_051409-smaller.png]](http://www.niflheim.net/droidbuilding/images/four-nines/20220727_051409-smaller.png)
All four arms for the droid (minus a few parts I didn't lay out):
![[Image: 20220728_152018-small.jpg]](http://www.niflheim.net/droidbuilding/images/four-nines/20220728_152018-small.jpg)
The lenses will need to be sanded and polished to clarity, much like my Treadwell lens. There are a few malformed bits and defects to clean up on the arms, but they came out reasonably nice. I didn't really build in a way to attach the arms to anything, so I'll probably just glue them to something.
Having put the head together, I think my droid's eye surround is a bit small ... in some shots it seems to cover maybe a 70-90 degree section of the head (guesstimating that mine's more like 40-50). But I might change my mind once I see it on the body, and I'm not reprinting it at this stage ...
... because I've already hot glued all of the washers to the inside of both hemispheres, as depicted in the last post. I've achieved pretty good coverage of metal on the inside with this process. I went through an entire box of 100 1/4" washers, as well as some from a second box. I also picked up a small number of #8 and #10 washers to use to fill in a few smaller gaps in the coverage.
I've also test fit the halves together. Note that you have to be careful the washers don't protrude much above the edge of their hemisphere, as any that do will strike the four arms as you screw the parts together. Mine do protrude a little, but not enough to be a problem.
I've tested this arrangement with one of my magnets, and even through the 5mm thick plastic of the head AND the plastic the magnet was housed in AND a small air gap, the magnet still had a decent pull on the head. It's hardly enough to lift the head by itself, given all the extra mass of those washers, but once all three magnets are in place it should help keep the head tight enough to get traction on the rotation wheel. Especially given the magnets will be below the head so gravity will be assisting.
The magnets make the rotation ever so slightly "jumpy" rather than perfectly smooth, since they prefer to maximize the amount of metal centered in their field, but I don't think it's much of an issue.
I also broke out my resin printer and printed out some parts.
Lenses ... LD-F1 on the left, Four-Nines on the right.
Four-Nines' lens in situ. Note the camera is making the eye area appear larger than it does to the naked eye:
All four arms for the droid (minus a few parts I didn't lay out):
The lenses will need to be sanded and polished to clarity, much like my Treadwell lens. There are a few malformed bits and defects to clean up on the arms, but they came out reasonably nice. I didn't really build in a way to attach the arms to anything, so I'll probably just glue them to something.