A housing to fit a cheap USB-C to UART adapter.

This is a remix by modification of the original FreeCAD files of the mini-USB version.

Changes:

• redrawn the USB-C connector opening

• added recess with generous clearance around connector opening

  • remaining wall thickness aligns with gap between connector housing and port when fully seated

  • tested against some fairly bulky USB-C plugs that tend to have issues fitting into other USB-C ports

• rounded over edge of the recess using a fillet

  • mostly for rendering, print with and without is almost indistinguishable at 0.4mm FDM

• slightly narrowed the internal blocks next to the connector

  • there was marginal interference between the USB-C connector opening and the blocks

  • unfortunately this puts the hole quite close to the wall

• directly exported as STEP

  • the original was first meshed in FreeCAD, potentially because exporting directly as STL or 3MF yields a broken file

  • bonus: smoother curvature

Lid:

• Made a version without the screw holes

  • by suppressing Pocket001 and Pocket002

  • the snap fit is sufficient for me and it makes it much easier to print

• Exported the lid as STEP to get better detail

• I didn't change the lid geometry, it remains problematic to print

  • I simply sunk the lid by one layer height, getting rid of the most problematic flat angle overhang

The prints as shown highlight how printing the lid flat side down, admittedly without supports, is problematic due to the fillet chosen for the original. You end up with free floating paths. Also the fillet leads to a very shallow angle directly above the build plate.
I've sidestepped both by sinking in the models by a layer height (0.2mm in my case) and leaving out the holes, as the snap fit is sufficient.

As per original instructions ISO7380 M3x6mm screws can be used, but I found it a very tight snap fit.