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Revised Left Side & 3D Print Fine-Tuning

A project log for PolyKybd (Displays In Your Keycaps)

Freedom at your fingertip.

thpollthpoll 04/27/2023 at 05:200 Comments
As promised in my last post, I transferred the (for now) finalized PCB design from the right to the left side and already ordered 5 assembled boards that are in production right now!

The same thing was needed in the past when transferring the initial PCB design from the left to the right. This time, it turned out less painful (TBH I would like to automate a lot of things, maybe with skidl and pcbflow as mentioned in that article: https://kbd.news/Keyboard-as-Python-code-1834.html).

At the same time, I was iterating on the 3D resin prints. Here is the case, which was an almost 100% fit. I did print it first on my FDM printer before, but the tolerances are just a bit different:

The gap between plate and case is a bit larger than I wanted it to be. The fix was easy and the new version should be spot-on!

On the picture above, the print looks a bit scratchy from the post processing, but it is not so pronounced under normal light conditions. In fact, I was surprised how great all the parts turned out.

Only on my second batch, I had a few parts with some excess material here and there, that in my opinion, comes from a faulty resin printer LCD/mask:

You can see a little blob on the middle element. I hope that was just a one-off issue.

The cirque trackpad mounts do fit. However, I have to raise them a bit higher from the plate, otherwise the finger drops too much down when reaching for the trackpad. Also, the keycap stems need some more tuning:

While I can just push the FDM print onto the MX-cross of the switch, the resin print is not so flexible and then sometimes cracks. Making the cross cutout at the bottom just a little bit bigger should fix that.

While waiting for the assembled PCB, I'm working on the software side and it is about time to do that :)

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