Morning everyone. When milling plywood, are there any issues with the spindle bit gumming up or getting dull faster than standard wood over time?
Endmills will dull / wear even when cutting wax or plastic, and have to be considered a consumable.
Whether or no plywood is rougher on the edge depends on the quality of the wood, if any fillers are used and the nature of the adhesive. Usually it wears more.
Cutting any material that contains adhesives, such as plywood, particleboard or mdf, will generally dull a blade or bit more quickly than plain wood. In the same way, most plastics are more dulling than wood.