Anyone ever have a problem with their delta printer where next to and away from one tower, it will test higher than next to and away from the other two towers?
In other words, if you draw a line across your build platform from one of the towers, the nozzle will be higher the closer it is to the line? It is about 1mm of a height difference.
Sounds like your arms aren’t all the same length.
The arms not all the same length would have the same effect as the adjustment screws being set differently. It is not that. It is about level along that line.
No, I’m pretty sure that what would have the same effect as platform adjustment screws not being set is if your endstops are off (not in a plane parallel to the platform). Having unequal arm lengths when the math assumes that they are equal should result in non-linear movement.
Could also be that your towers are not equidistant. Actually, I think this better fits the problem you’re trying to describe.
I was thinking either the arms are effectively unequal lengths due to bowing or the towers are not square. Maybe both. The towers should be equidistant because it was a kit with laser cut parts (melamine).
Assuming the laser isn’t out of whack and the melamine isn’t warped. Speaking of warped, I assume you’ve checked that the bed you’re measuring against is actually flat.
The heated bed (under the glass) was warped ontop of the aluminum foil I used for insulation and my towers were out of wack. I would have tested the tower calibration, but I snapped an arm. grrrr…