Make file structure simpler
More WIP

Commit messages are hard for openscad.
Idler has something to brace against
Idler is more real
Printed groove mount hotend retainer
Maybe easier to print holes
Easier to work on while mounted

* Can unscrew shaft while mounted
* Easier to insert carriage-side bearing
Slightly DRYer. Slightly.
Prevent bearing from rubbing against plastic
Loosen tolerances
Carriage hole bracing WIP
New extruder print plate
Updated print plates
Progress on direct-drive carriagestruder for i3
Changes to improve ease of printing
Rendered plate of direct-drive carriagestruder
Avoid mid-air printing
Clean up around hobbed/filament/idler contact area
Updated print plate
Before messing with idler arm