Heaven help me - I've just bought a delta kit :-)

[curious aardvark]

Oh yeah I have found a filament she just can't use.
polymaker's polyplus pla. It's roughened, presumably to give better purchase for extruders. But the downside of that is that it just generates an awful lot of friction in a tight bowden tube. To the extent, that it just will not print. Shame as the stuff I have is a translucent light orange and would have been perfect for the tile holder. Tried a couple times, but just would not work.

It's expensive stuff too - so bear in mind if looking for quality filament. polymaker polyplus pla does not play well with bowden printers.