My panel are usually 10x20cm or 20x30cm
The 3018 engraver machines solution does not inspire trust. In fact, I would like to be able the less possible setting to do and have a repeatable process.
Do you know any machine that could cut the panel directly (without previously made v-cut)? Some kind of table saw for FR4 maybe... I don't care if part of the process is manual.
I don't know of another solution. Perhaps someone else has some good ideas?
Anyway, the CNC engravers are not bad for accuracy, and there is good PCB software like flatcam that can work directly off your PCB files.
It wouldn't be hard to turn the 3018 into a machine that very simply just does straight v-cuts - it would just be a very simple G-code file that is only a few lines long. You would just need a quick manual way to align the PCB and press start on the CNC (you would want the Offline Panel Option). It will lower the cutter, cut the groove in a straight line and raise the cutter. This is basically turning the 3018 into a device that just does straight line cuts at a preset depth.
If all the cuts are parallel, you could align the board once, and then just use the front panel to move the cutter left or right to the next v-cut position and press start.
You can use a v-cut, or just use a straight sided router bit to cut through the whole board - or even to cut the through board, but leave tabs.
Here are some cheap carbide v-cut router bits.
https://www.aliexpress.com/item/32794029970.html