OPK

OPK is a spherical top keycap profile developed in CadQuery and released under the very permissive Apache License 2.0.

It's especially suited for creating high/medium profile spherical top keycaps.

The profile is still highly experimental and very alpha stage.

Please help!

I'm new to CadQuery (CQ), Ptyhon and code based CAD in general. There's a lot of guesswork and fumbling around to get to this point, any help is very much appreciated.

Usage

If you are new to CQ, the easiest is to download a CQ-Editor pre-built package, load the keycap.py file and hit Render!

CQ and CQ-Editor are eveolving fast. It is important that you install the latest version of CQ and/or CQ-Editor. The latest CQ-Editor dev release can be grabbed from jmwright's repository, get the latest successful build (you need to be logged in to download).

The latest Cadquery can be installed with PIP:

pip install --pre cadquery

The main keycap function in the opk.py file has sane defaults and parameters are sufficiently commented.

The export directory includes a few examples in both STL and STEP format.

Some examples:

Create the default 1u keycap

cap = keycap()

Create a 1.5U keycap

cap = keycap(unitX=1.5)

Create a flat top (not angled) 2U keycap

cap = keycap(unitX=2, angle=0)

Create a 4U spacebar

cap = keycap(unitX=4, angle=1, convex=True)

A 2.25U Return key in system-default-serif font

cap = keycap(unitX=2.25, legend="Return", font="serif", fontsize=8)

Save and Export results

CQ can export in many formats including STEP and STL. The easiest way to export an STL in CQ-Editor is by selecting the model in the 3D view and then clicking on Tools > Export as STL.

Of course it can be done programmatically and that can make exporting an entire keyboard very easy. The following code exports an STL and a STEP file.

cap = keycap()

exporters.export(cap, 'keycap.stl', tolerance=0.001, angularTolerance=0.05)
exporters.export(cap, 'keycap.step')

Notes / Recommendations

Default angle is 7deg that should be a good starting point for Row 3.

For spacebars a small angle (0-4deg) is recommended.

Not all fonts will be centered correctly, choose carefully. I'll add some way to better center the legends.

The code includes an example to use a DXF drawing as legend (check the comments at the end of the keycap function). This will be exposed to the API soon.

TODO

• add stepped key
• add ISO Enter
• add 2U pos-like stabilizers
• add support for logos and graphical legends
• add reinforcement for big keys
• add more examples
• output files already supported for 3D printing
• online editor
• add secondary/tertiary legends
• add support for stems other than cherry
• clean up the code and do things "the python way"
• better documentation