Cup holder inset

Tired of not fitting your coffee mug in that fancy cup holder in your TV or movie couch? This model will fit into any existing cup holder, and provides an easy way to keep your coffee or evening tea stable while enjoying a movie.

The design comes in three versions:

* Solid (probably best for FDM printing)
* Hollow
* Hollow with a hole

The hollow versions should work for any printer, without supports.

Scaling this is fairly easy:

1. Measure the diameter of the existing cup holder (the inside diameter), pad at least a few mm's.
2. Measure the depth of the existing cup holder, and again pad a few mm's
3. Calculate the scale against the provide dimensions, and when printing, scale accordingly.

Example: My couch had a 80mm diameter cup holder, with a 70mm depth (both padded)

Scale X: 80/90 == 89%
Scale Y: 89% (same as X, since it's a circle)
Scale Z: 70/60 == 117%

Remember to pad your measurements properly, you don't want a super snug fit here, or it will neve