Trim router, also commonly referred to as a palm router. I have an actual Makita laminate trimmer, I suppose you could call it a “trim router”. It has a single high speed. Full plastic body, to include base. It is a higher quality, more expensive tool. Made in Japan. Interestingly, Makita tools come from all over the world(For instance, my saws all originate from the UK).
I recently purchased a couple reasonably priced Makita tools that were made in the USA(more accurately “Assembled”). And purchased another embarrassingly expensive tool from FLEX, traditionally of German manufacture(I believe they have been Chinese owned for some time now)… it was made in China. Over priced, but fine quality.
A small router, often referred to as a trim router, palm router, hand router ect, is just a small router. One handed operation, tight places ect. Uses a plenty. Pattern work. Fitting doors. Sizing/Trimming. Finishing. I’ve fitting many hundreds of doors in with the same Porter Cable palm router. It is my opinion that the trim router is more capable than my machine machine(3xxl). Countless commercial shops run standard routers on their industrial machines, sometimes multiples of them to facilitate simplified tool changes. They even make pneumatic tool change systems for standard routers, or at least they did.
To the OP: The Carbide3D router is not comparable in quality to something like the Makita RT0701. I’d get a replacement Carbide router, and buy a Makita RT0701(optional of course). I’d put the Makita on my machine, and throw the C3D router into the Makita’s included base. Then you can easily trim off tabs, onion skin, add a chamfer or round over; a handy dedicated tool.