Wow I can't believe how off topic things have gotten, and how much energy is being consumed. It looks like there is a 1.0 -> 1.1 so minor revision.

I can confidently say as a customer (not someone who is thinking of buying) that I expect revisions and major upgrades to be released. As long as the product I bought meets my requirements, I've not been disadvantaged, underserviced or left behind in anyway. I got what I needed, and paid for, even if a new one comes out tomorrow.

The Duet team is incredibly honourable, and many have given 100s to 1000s of hours of their time supporting this community.

I love that Voron design posted previously which really integrates the tool board into the carriage assembly. Nice work.

Can't wait for v1.1 to arrive in Australia. Everything should land here first, as we're upside down, underneath most of you, so a few boards should fall down here quickly I think

Well one thing I hate about forums is when you see these big problems discussed, and advice and solutions offered, but then there's an abrupt stop in the conversation, and you never know what happened.

Several weeks ago, as you may have read here, I was really struggling with my supplied build plate, as it's 500x500 and only 4mm thick. Also, I struggled to find anybody in Western Australia, that could supply an aluminium plate that was guaranteed to be "flat", and when I enquired in Sydney, there were limited options for tool plate.

Long story short, thanks to the collective experience of everybody in this forum, I learned how I should go out and source a new plate, or at least, work with the constrains arising due to my location, and get a plate produced.

I found an engineering company here in Perth that could start with a 10mm plate, and machine it. Their advice was it would have to be machined on both sides, because of surface tension. Turns out, to get the plate "flat" it had to be machined 5 times. The resulting thickness was 7.7mm, which thanks to the advice above I know would mean there is minimum sag, due to own weight.

So I got the plate installed, and added my 6mm glass plate and finally got by bed mesh done.

I think it's safe to say the result is amazing.

I have a few more things todo before I can actually print, but I have my "shutdown" and "startup sequence", which puts me in a great place with consistent bed mesh results.

1. I have mechanical endstops for X and Y, so my homing here is pretty accurate
2. I use stalling on my Z axis, and send the plate to max-z until it touches the couplings. And I call this my "parked" position"
3. I now have a macros that raises the bed 480mm from the parked position, then I home all. So X then Y then Z all home.
4. When I execute G29 now, I get an amazing height map.

Now I have to say the bed has been an investment, but clearly a worthwhile one. The plate cost me $280 AUD. The glass was about $25.

I've been cautioned about my bolt mountings, where the plate rests on the springs/bolts. The concern being, will the aluminium expand when heated (of course it will, by about 0.7mm), so the question comes will the plate be able to expand with these bolts in place without being completely constrained, therefore warping. Some thoughts on this would be useful.

Largely though, my issues seem to all be resolved.

@o_lampe I did contact one tombstone supplier, but they were a dead loss!

I don't know if it was CoVid invoked, but the guy couldn't stop coffin. (ouch)

I think if anybody could make a printer lift a monolithic build plate, it would be @deckingman

Thanks every one - dropping the Zoffset slightly, in config.g has brought the nozzle spot on to 1mm from the bed with Z=1.

@sinned6915 I'm not sure I actually stated any expectations, nor questioned anyone's credentials. I'm here to seek a simple answer. The simple answer to the question just needs to be "a plate of x and y size, needs to be z thick". Based
on many other factors then I can make a decision, with one more blank filled in.

I've seen terrible warped beds work "ok" (I used to have one). So I know not to "need" perfection. I'm pragmatic.

Many times I've got through life with "good enough" solutions, by listening, learning and then acting, learning some more when I stuff up, and iterating. That's all I'm doing here. I'm not sure how the impression was gained that I'd be acquiring iron or granite plates. I just find this diverse thinking interesting and educational.

@phaedrux - see, that's what I'm talking about! Innovation, dare to explore and try. If we gave up easily, there never would have been reprap in the first place

BTW @Phaedrux - have you patented this, coz I might try :0)

@sinned6915 I'm not sure I actually stated any expectations, nor questioned anyone's credentials. I'm here to seek a simple answer. The simple answer to the question just needs to be "a plate of x and y size, needs to be z thick". Based
on many other factors then I can make a decision, with one more blank filled in.

I've seen terrible warped beds work "ok" (I used to have one). So I know not to "need" perfection. I'm pragmatic.

Many times I've got through life with "good enough" solutions, by listening, learning and then acting, learning some more when I stuff up, and iterating. That's all I'm doing here. I'm not sure how the impression was gained that I'd be acquiring iron or granite plates. I just find this diverse thinking interesting and educational.

@deckingman Gold!

@theruttmeister - I've never been to the "real" Perth, but I'm originally from Yorkshire. But you could tell that from the accent, right?

So the best answer to the question sounds like ~22mm

@jens55 we are kindred spirits.

@o_lampe I did contact one tombstone supplier, but they were a dead loss!

I don't know if it was CoVid invoked, but the guy couldn't stop coffin. (ouch)

I think if anybody could make a printer lift a monolithic build plate, it would be @deckingman

@jens55 I do like the look of that. Reminds of the Jubille. Very clean build.

Cheating? Who made the rules?

@theruttmeister yep much of what you've said on aluminium I've either done on previous build (525x525 + kinematic mounts). The granite is a fascinating idea too.

Here in Perth, Western Australia, we focus on getting iron ore out of the ground. So buying a tipping tray for a 250tonne capacity hail pack is easier than getting MIC6. Typically we have to wait weeks. Also shipping interstate at rates where shipping doesn't rise above material cost, can take weeks, if needed the thing you want is available in country.

So sometimes we have to get creative

@slimshader hey thanks for the insights. I'm not a first time builder, and all of these "safety" aspects are built into my current (pardon the pun) 525x525x8.5mm build plate.

8.5mm? Yep it was an extruded aluminium plate milled down from 10mm to until had <= 0.1mm deviation across the surface. This is kinematically mounted, so expansion is taken into account. Mains powered/SSR, of course, fuse, of course.

Weight is easy to calculate once I know a thickness that is required to reduce the bowing to an acceptable level.

Thanks again.