Update:
Okay so all of the prototypes have arrived, and I have been looking over and testing them out.
1) The slider was really, really good and only thing I changed after testing was to make the bump smaller as it was a tad bigger than I truly needed it to be. This means that the travel of the click leaf will be affected even less because of this, which is great. I would take pictures but the parts were printed translucent and my camera can't focus on them at all, so it looks way too blurry.
2) The top housing was almost perfect, just have to make a change to better support SKCM Brown tactile leafs, as it was still interfering in one part, but I figured that would happen and that was one of the things I planned to test with this prototype.
3) Sadly I only got one side of the inserts printed, but I had a spacebar with two sets of stab locations so I was still able to test them without issue. When lubed, they are super, super smooth. I made a linear space bar from an SKCM Black as that is the only alps board I have with a 6.25U spacebar, and they are perfectly matched. Only thing I need to change is the spacebar can spin a tad because the insert groove for the wire is too deep and doesn't rest against the wire when sitting at "rest", or the unpressed state, Which is an easy fix. I need to get a quote from someone to print these and to check to make sure that they are okay with printing this many parts, as it will take a ton of material for them and not everyone would have that much on hand.
4) In my last post I gave an estimated schedule for the GB, I want to make a revision to that. That time frame was if I used a different manufacturer than I will be using. To make it easier to explain, The original one I was going to use is Manufacturer A, and the different one mentioned for the schedule was Manufacturer B. I was planning on using A originally, but wanted to see what B could do as they manufacture in the US, which means faster turn around, and I quoted the schedule as if I were to use B, because I expected pricing to be similar to B's first quote. The issue is pricing for B was more than A by about $0.10 each, which would put the pricing at $0.60 per slider. Whereas if I use A, I can sell them for $0.50 each, but they manufacture in China, and that will take longer than if I used B. This is a hard choice, but I will be using A as I can't raise pricing that high, so the schedule for manufacturing needs to be increased to 15 - 35 days, as shipping to me will take quite a bit of time. This is an estimate, and can take less time depending on how fast they actually ship it and I have never dealt with customs before, so I don't know what to expect. So because of this the window for completion is 36 to 70 days.