Add new REV D version of BTU mod (#27)

- This updates the BTU top to the REV D version of the Ploopy top, which
  is screwed together using self-tapping screws instead of M3 screws
  with threaded inserts.
- This is untested so use at your own risk. There may be another change
  brought in with REV D that I've missed, and not copied into the mod's
  REV D.
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George Bryant 2022-02-10 16:52:25 +00:00 committed by GitHub
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@ -9,10 +9,17 @@ Ball transfer units (or BTUs) are omnidirectional bearings, as opposed to the si
This mod is a new 3D-printable top piece for the Ploopy which contains holes for ball transfer units instead of roller bearings. This mod is a new 3D-printable top piece for the Ploopy which contains holes for ball transfer units instead of roller bearings.
Designer: [George Bryant](https://github.com/gbrnt) with help and bearing advice from [/u/d4baller](https://reddit.com/user/d4baller) Designer: [George Bryant](https://github.com/gbrnt) with help and bearing advice from [/u/d4baller](https://reddit.com/user/d4baller)
## Versions ## Versions
### REVD-BTU
This version is the version you should use if you have a REV D Ploopy top.
You can check this on the underside of your original top - there should be a large letter D,
and your screws will be self-tapping screws.
It supports both the original ball and the new larger (45mm) ball.
### REVC-BTU ### REVC-BTU
This version is the version you should use. This version is the version you should use if you have a REV C Ploopy top.
You can check this on the underside of your original top - there should be a large letter C,
and your screws will be M3 screws.
It supports both the original ball and the new larger (45mm) ball. It supports both the original ball and the new larger (45mm) ball.
### v3 and v4 ### v3 and v4
@ -50,7 +57,7 @@ Follow [Ploopyco's recommendations for print settings](https://github.com/ploopy
* Install the new top piece on the trackball. * Install the new top piece on the trackball.
* Give it a try! * Give it a try!
### Threaded inserts ### Threaded inserts (Ignore if using REV D)
You'll need 4 heat-set M3 threaded inserts for the screws which attach the top to the base. You'll need 4 heat-set M3 threaded inserts for the screws which attach the top to the base.
These can be bought from a variety of sources - you should use ones which are made for 4.0 - 4.2mm holes. These can be bought from a variety of sources - you should use ones which are made for 4.0 - 4.2mm holes.
Recommendations for installing these are in the [Ploopy trackball assembly guide](https://github.com/ploopyco/trackball/wiki/Ploopy-Trackball-Kit-Assembly). Recommendations for installing these are in the [Ploopy trackball assembly guide](https://github.com/ploopyco/trackball/wiki/Ploopy-Trackball-Kit-Assembly).

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