I’ve heard many times over that to test backlash in a printer you can grab it by the nozzle and wiggle it around (with the nozzle cold of course, but with the motors powered up). Ideally nothing moves, but when I tried that with my Tiko there was a disconcerting amount of motion. The motion came primarily from two sources, the motor mounts and the flexible delta rods. The movement from the rods at least offered up a bit of resistance so I expect those to be only an issue at higher speeds, but the movement in the motor mounts offered almost no resistance.
I assume this is the source of many of the unexpected motion I sometimes see from my Tiko, the jumping to the side when moving the nozzle up and down, the shifting when trying to print a straight line. You can see some of the shifts in the raft print above, the nozzle will be printing a straight line and it will shift to the side. Interestingly you can also see some craters in the filament, that’s what happens when you don’t store your filament properly and it absorbs moisture (I’ve mostly been testing unspooled leftover filament that wasn’t stored properly). I store all of my open filament spools in watertight bins and with rechargeable desiccant, but you can read more about that here,