Hey waahhoo,
the Onefinity offers the stock 65 mm mount and the optional 80 mm spindle mount. Since the Makita RF1101 seems to have a 82.55 mm motor housing, you will hardly be able to mount it to the Onefinity.
Note that outside of the U.S.A., the Makita RT070x hand trim router always comes with 6 and 8 mm collets. You can get them as replacement parts in order to use bits with 6 and 8 mm shanks.
Screenshot: Excerpt from Makita Catalogue. As you can see here, not only is 6 and 8 mm the standard collet size, but there are only cordless hand trim routers left in Japan. Brushless DC motors – not the badest thing!
I just received a 6mm and 8mm collets from a supplier on Ebay.
Makita 763636-3 6mm Collet Cone 3620 RT0700 RT0701 MT361 RP0900 3709 3710 MTR050 | eBay
Makita 763618-5 8mm Collet Cone 3620 3608B RTO700C RT0701C RPO900 DRT50 MT361 | eBayI had my doubts about the cone 8mm but it seems fine.
→ You may also be able to get collets with other sizes, metric as well as imperial/U.S. customary, for the Makita RT070x.
What is bit sad and often leads to problems is that the proprietary Makita collets do not hold the bit as safely as an ER collet does.
Unlike ER collets, which clamp the bit shaft over a longer length and therefore much reliably, the Makita collet just clamps the bit on the beginning of shaft (see length of conical part on picture, it is extremely short on Makita):
Makita collet
ER collet
There exists Makita-style routers that have real ER collets, e.g. the Carbide router that would also fit the Onefinity CNC. Of course a real ER collet is a huge advantage over a router collet and avoids the lots of issues of router not holding the bit.
Further reading
The Makita router ate the big log – Post #1 by Bear
Makita Router Overload – Post #1 by RexH
Fire Safety in workshop – Post #9 by Aiph5u
Largest clearance bit the Makita router can use – Post #2 by Aiph5u
Makita Bearing went Bad – #4 by ConvenientWoodwork