Heated Bed Doming in the Middle

[inventabuild]

I adjust #define PRINTER_RADIUS up and down by +/- 0.5 and it does not change the z-height at all when I run the code:

g28
g0 z5 f3500

So I tried adjusting #define PRINTER_RADIUS by +/- 10 or more and still the z-height does not change.

Why doesn't #define PRINTER_RADIUS affect how far up or down my nozzle travels in the center of the bed?

[Polygonhell]

You have to measure at the outside points and compare to the center to see any difference.

[lordbinky]

Well, first you're thinking about it backwards. Think of it more like the center is staying the same height and the height at the edges are being adjusted by PRINTER_RADIUS. So it very well could be that it is making a change if you haven't made a comparison to the Z-height outer edge. The outer edge may be changing +/- 3mm when you did the +/- 10 on printer_radius and so just looking at the center Z height, you'd never see the change. That's also why you have to adjust each of the endstop screws to get the z-height at the edge of the bed near each tower equal, then check where how the far the center is off from those heights.

Now if you're already going through the whole process each time like the guide says, you need to make sure you disable the eeprom in the firmware while making your printer_radius changes or else it won't update the value. This will eventually be changed in a future firmware update to allow you to change it real time in the eeprom settings, but right now that is only something to look forward to at some magical unknown point in the future.

[lordbinky]

You have to measure at the outside points and compare to the center to see any difference.

Sheesh, just state it simply

I read that and thought 'Or you could just say it like that'

[inventabuild]

Got it, thanks for the answers.