Yup I save all the time.
Well, looking at it, Now I remember why I put the steppers on the moving block…it saves a ton of room.
Okay, speak up on this one. Moving Z stepper saves about 40mm in height. A moving stepper is heaver…but it seems we will be using a brake either way, so does that matter?
Sorry I was typing and didn’t hit save. Should be rolled back with a Z rail now.
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I remember you talking about 42mm in the beginning. So less than 2". I know we have talked and talked about brakes but has anyone actually got it working on a functioning printer yet? and one with klipper?? If we are 100% positive that we can get the brake to work 100% and for more than JUST power failures then I will be on board with leaving the motors on the moving block. But if we arent 100% sure then less than 2" taller is not anything thats ever going to make a difference to me. It can be a foot taller and wont matter for me LOL. I know everyone’s situation is different and I know even more so for you with the farm. I am just really tired of burned out boards LOL. And those constant tension springs that are enough to actually do anything are WAY too big so that doesnt seem like a viable option to me.
I am messing with a Sketch in the new component. And using pen and paper.
Little break for a test fit. I messed a couple through holes but the rest seems good enough. Smaller in real life.
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That looks great! Are you planning to use heat inserts for the mounting the EBB boards or just threads into plastic? My choice would definitely be heat inserts. I always tent to screw up threads in plastic
Big printers we will need them either way, brake, or spring. So if it is getting added anyway, might as well save the room?
I promise there are small ones, I have a bunch around here I just have to stop to look for them.
Either way, we did the weight earlier and taking steppers off on a bigger bed still needs a “brake” to be safe right?
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No they are huge and add to the BOM. The CAD is there you can edit it to add them if you want. Just change the hole size of the ones you want. They should clear the belts even if you go larger.
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Ok. I will trust you the same as I always do. If you are confident that we can come up with one or both that will work good then I am on board with keeping the motors on the Z blocks. But please don’t leave me hanging to figure out how to mount these springs on my own LOL. I spent a week looking at it on the V4 and just threw the springs in a drawer and left it alone. Nothing I came up with would work for both ends.
Ok I am good with that! Just wasn’t sure what you were thinking. I didn’t think you would want to use them but wanted to be sure. Thanks!
You are definitely not making it easy to stay on topic… AAAAArgh. You can now delete this comment. 
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I thought about the heat set inserts when making it…but the space is tight, all the holes and stuff was not much room. I remade that part probably 10 different ways. I also figure someone is going to ask for some other CANbus card to be adapted so I figured just the most simple flat plate would be the easiest to modify, because I am not doing requests for all parts.
One way or another we will have a brake.
I want them up top but is sucks up so much room, and then that means the bed mount is a huge hook shaped thing. I can put them at the bottom and use the extra 20mm room from the bottom frame rail, but then the stepper is only mounted with two screws pretty close together.
Looking more closely, we gain at least 20-25mm on the bottom, and 20 on top. 40mm is not the end of the world. I am going back and forth.
Less parts with the moving Z stepper… I am going to keep going that way unless someone has a good reason not to. Two printed belt mounts at each end, and the Z mount can be a plate sandwich like the trucks, with the Z stepper tension-able instead of moving a block. Should look great and save us at least 40mm. This will put the stepper wires bundled with the bed mains wires though…hmmm.
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Yeah I hope no one expects that. But I will say I appreciate you are going father with options than you did with the V4. I haven’t seen anyone here talking about anything other than the EBB boards, but I know there are others out there so who knows LOL.
Thank you!
I haven’t seen any kind of drawing for up top so I could be way off but what pops in my head just doesn’t look good. So ill keep my vote for bottom or moving lol. If moving I will definitely have to take a better look at how to manage those wires. I did NOT do a good job of that on the V4, or really any of the wires LOL. I think its getting a major wiring overhaul soon with all electronics moved to the back and out of the way. We need a canbus board with 3 2209s on it to mount to the bottom of the bed support and run all 3 steppers off of 4 wires like the tool head boards LOL. You can hook up multiple canbus boards in klipper!
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Okay, that brings us to another question.
Do we want to use the V4 stepper mounts, and just update the belt holders, or plate sandwich V5 mounts…
I’m essentially 100% on this. I don’t think it’s hard.
I’m dubious about the spring idea, personally, at least as a method of preventing bed falls. As a way of taking load off the steppers, maybe that’s valuable, no opinion personally.
Duh. lol.
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Doesn’t matter with reliable brake mechanism?
Yeah, vaguely recall link for narrow ones shared on the ebrake topic. Sounds good, am dubious about the electronics working reliably 100% for 100% situations 
EDIT: Found Paul’s post with link to 3/8" wide springs, there’s a bunch looks like some experimenting needed if trying this out.
wrt inserts. Personally prefer design to just require nuts and bolts if possible. Simpler/faster to assemble, just use medium threadlocker.
Was imagining bulk of the coil rides with the moving Steppers, so only the end is attaches to modded Z Belt Holder.
Between hotend and PTFE needing to flap around, we need ~120mm height Lid anyway, so, guessing there’s plenty of room up top, especially if XY steppers are at the back?
There seems to be some space. Would repositioning Z linear rails to be on front (or rear) face of the upright extrusion enable simpler CNC’d plate based Z Posts? Belts stay pretty much where they are. Can Z Post end up just being a CNC’d/laser cut plate, with no/minimal printed part(s)?
If Linear rail block ends up being proud of extrusion. Not a problem if open frame. If someone wants to enclose, they can make cutouts in their panels, and optionally print/CNC a shroud to cover where the rail blocks are moving, if they care even. If people are are wanting fancy pants exterior polycarbonate panels, then they also have the budget to build 2040 frame.
Could avoid 2040 frame and cutouts in panels by using standoffs. But don’t think standoffs between panel and frame is good, because direct contact between true square panels and frame will help with squaring frame, rigidity, etc…
If people have budget for 2040 frame, they might want to experiment with having Y rail horizontal on top (kinda like prusa xl) too assuming Z Steppers don’t end up on top.
EDIT: Would isolating the Z extrusions with linear rails attached from panels reduce vibrations/noise too?
Can’t cross the rail, up top in this case means just under the Y rails. They do not fit well there.
None of them are thin enough to not have clearance issues with the enclosure walls for those that will use them. MGN9’s are 20mm exactly.
agree
That is an entirely different XY build from what we currently have, not an easy edit, we did not do it that way because we benefit from the sandwich effect.
Z barely moves, all the noise comes from XY.
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