A variety of routers can be used with the CNC machines.
The video below shows a number of ways to attach differently shaped routers.

The routers need to be attached securely so they do not rock or tilt. This requires attachment at both the top and bottom of the router.
Router Attachment Video

Stanley Black & Decker is the parent corporation of the Porter-Cable and DeWalt brands. These older Porter-Cable and DeWalt laminate trim routers were similar and shared some part numbers. The two units shown here are still serving well in this shop.

Unfortunately, these models were discontinued and are disappearing from retailers, though they are still available on EBay. Their newer replacements will also work, though the mounting system shown next will be different.

Dewalt and Porter Cable trim routers
DeWalt and Porter-Cable trim
routers have parts in common.
The bases of the above routers can be rotated so the router is easier to mount to the Z axis.

Rotating the base can eliminate the need for a bracket that accommodates the position of the base's screw hole.

To rotate the trim router's base, remove the four screws from the base as shown in the drawing. Rotate the base so the cord and switch point in the desired direction, and so the 1/4 inch bolt hole in the router’s base faces the spindle plate.

Reinstall and tighten the four screws.

Do not pull downward on the base, or the commutator will be pulled from the brushes. Should this happen, the top can be removed to access the brush assembly.
Rotate Dewalt and Porter Cable trim router base.
Screws in router base.
Other trim routers can be used. They can be tied to the Z axis with clamps like the ones shown here. The above video gives more details and options.

CNC Router Mount
Muffler clamp and wooden cradle.

One mount uses the base of a muffler clamp with plumber's pipe hanger. The other is a shop-cut wooden cradle with a band clamp.

CNC Router Mount
CNC cut router clamp.

Another option is a custom CNC cut cradle as shown here.

This was made by Nick for his 25x25 as shown on the gallery page.
The Makita 1101 has served well in this shop. It has 1/2 inch and 1/4 inch collets, and is variable speed.

It has received good reviews, and is one of the quieter full sized routers.

The same motor body assembly of this router is available with different base and handle configurations. Only the motor body is used on the CNC machines.

Though the machines will not be able to push this router to its stalling point, it can still be handy to use because of its longer life and its larger collet capacity as compared to trim routers.

Cradles with band clamps can tie this router to the axis.

Makita in cradles
Makita 1101 in cradles.
Auxiliary speed controls, such as the one shown here, work well with the lower priced single speed trim routers. The remote speed control is more convenient to use, as compared to a variable speed router, since the speed can be adjusted while the machine is moving.

It is also safer since it is unnecessary to chase a variable speed router's control dial around the table.

These controls are available from woodworking stores and Harbor Freight; prices start around $20.

Speed Control
Speed control.