How many times can I visa jump in Thailand after one extension and one trip to Cambodia?

Interesting post

Yes, keep on going. There is no limit other than an employee at an Embassy who decide no more abusing this type of visa or an Immigration Officer trying to do his work.

You might opt for the visa that fits your purpose of stay and get 1 year Extensions in Thailand to avoid the travel and harrasments at consulates or borders.

I doubt you're "visa jumping" what ever that is 😮

You either are talking about border bouncing <- where you go to a border, stamp out of thailand, stamp in and out of another country and then stamp right back in to thailand <-which you can do by LAND two times in a calendar year

OR

You're talking about visa running <- where you go to a thai consulate in another country and BUY a visa for thailand then come back