Supports printed on different layer than other parts of the model  

RE:

> The layer height of supports has always been independent. 

Oh, never noticed that, thanks for the info.
I guess this explains why sometimes my supports were knocked off?

RE: Supports printed on different layer than other parts of the model

No that shouldn't be because of the layer height.  I use supports when required (often) and I've rarely had issues with them.  Then again I generally use snug supports and my bed adhesion is dialled in.  They do not detach from the plater and the zigzag and interlinking of the structure make them quite sturdy.  

I have seen reports of problems with Organic supports though.  Tall thin supports like those with small base sizes are going to be prone to issues, especially as the extrusion width settings for supports makes the extrusion thinner, making them weaker (easier to break apart to remove).  I'd recommend making the extrusion width the same as normal perimeters if using Organic.

If your supports are being knocked off then as with all things check your bed adhesion, the usual causes, live z and bed cleanliness.  If needed such as when using the textured sheet then increasing the Support Material> first layer expansion setting to increase their bed surface area is sensible.  

Took a look at your project and you are using way too much support.  The gridfinity base part should print with zero support.  The magnet holes are designed to bridge.  The holes for the bolt to join the 2 pieces should also bridge and any slight sagging at the tops of those holes can be reamed out with a drill bit by hand.  The only parts that need support really are the post and the area that supports the nut.  

I'd print it with supports like in the attached modified project.

RE: Supports printed on different layer than other parts of the model

Thanks for the details.

>I have seen reports of problems with Organic supports though.
In general I was using Grid support but it was quite massive, then switched to Organic and overall it was good but I had maybe once or twice one support being knocked off but not from the first layer (that is directly from the bed) but higher, usually on next layer (because bed sticks so well that even slight nudge makes a lever and second layer just rips off from the first layer due to tension) or somewhere high where the organic support changes into thin tube.
I switched to Snug and so far it works best for me. I just haven't noticed previously that support and model layers are iterated differently.

>Took a look at your project and you are using way too much support. 
Yeah, that was an overkill just to check how supports are generated and printed, those models of gridfinity base I use are printed without any supports. Normally I just use paint on supports as you did.