Large corexy mechanical kit options
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@Corexy I haven't looked at Mark's design but I'm sure it works very well. For my own printer, I chose to use 3off 1mm lead, screws (8 X 1 single start) driven by a single motor and continuous belt and can say that works well too. For what it's worth, I'd say that either approach will work well. Maybe the way to decide would be to look at the cost and lead times (no pun intended) for each and see which would be the easiest to source in your part of the world.
Edit, my bed is also 400 X 400. -
@deckingman said in Large corexy mechanical kit options:
@Corexy I haven't looked at Mark's design but I'm sure it works very well. For my own printer, I chose to use 3off 1mm lead, screws (8 X 1 single start) driven by a single motor and continuous belt and can say that works well too. For what it's worth, I'd say that either approach will work well. Maybe the way to decide would be to look at the cost and lead times (no pun intended) for each and see which would be the easiest to source in your part of the world.
Edit, my bed is also 400 X 400.Cheers Ian,
I'm a strong believer in lifting the Z axis/bed via 3 points, for the same reason I like 3 point bed leveling. I not only want my build plate dead level and true, I want the mount plate it sits on to be close as well. I don't want to build something that's bent like a banana and ask 3 steppers and software to fix it up for me. To be honest I'd like to switch off all leveling, or at least have it that it only needs the mesh updated if I change/move something.
As the kit comes with the option of 3x lead screw, it's probably a big enough modding job to tie the 3 of them together with a timing belt, by the time I rig a belt tensioner etc.
I've got to sell something to fund this...Minister for Finance (and war) has hat a gut full of my shenanigans at the moment. been a bit spendy lately.
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@Corexy said in Large corexy mechanical kit options:
............To be honest I'd like to switch off all leveling, or at least have it that it only needs the mesh updated if I change/move something.
Yup - that's how mine is and it's so nice to be able to turn on the printer, select a file and hit print. My slicer start code calls a macro which heats everything up and runs home all but that's all I ever do. I've never used any form of firmware levelling or flatness compensation - being a mechanical engineer (retired) I always prefer the mechanical solutions. At the last TCT show, I took the XYUVAB assembly off the base which is the Z axis, put the bits in a van, transported it 60 odd miles, carried it to the stand, put it back together, set the Z offset (because I have to remove the Z axis switch when I take the the printer apart) and started printing. Didn't even bother to check that the bed was level. Did the same in reverse but when I got back home I did re-check the bed level - no adjustment required. Job's a good 'un.
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Yep, and for those who doubt the V slot rollers, these prints have come off a dead stock Ender 3 Pro. The only mods on this printer are 4x M4 nyloc nut on the bed leveling screws, and the ABS printed (which burned into my magnetic build "mat"....doh) fan shroud.
$311AUD delivered for the printer, plus $0.50 for nuts/plastic.
It's all about the mechanical setup and adjustment first. Software compensation should be the last and subtle resort.
Edit: Hope you don't mind, I fixed your image tags. @droftarts
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No worries at all. How do you do that, it's just started happening?
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@Corexy Nice prints!
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@deckingman said in Large corexy mechanical kit options:
@Corexy Nice prints!
Cheers mate.
I did just want to demonstrate the potential of the v slot wheel system, and to be honest with me being so crap on the keyboard I wanted to show that us old "mechanics" still have a place in the hobby lol.
@chas2706 said in Large corexy mechanical kit options:
Excellent print quality.
Any chance you can share your config.g?
Mate...I don't know how to tell you this, but that's a bone stock E3 Pro, with all it's 8 bit goodness.
The only things fitted to that printer are 4x M4 nut and a plastic fan shroud. I do have a few tricks up my sleeve in my S3D profile, but nothing too fancy.
I hope to demonstrate to new players that buying a printer and modding the hell out of it straight away is not necessary. Software compensation will not cover a multitude of sins either.
It needs to be assembled and adjusted correctly from the start.
I ran the same print on my Duet/Zortrax in ABS, but I've got a bad Z wobble that seems to be built into it when it reaches the top of its range. I've got to work out some sort of Z isolator for that one.
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Back on point,
I've spoken to the Rat Rig guy, and he's been right on it with the responses and advice.
I did mention the lead time, and he said they got behind a little at one stage, but they were right up on it now.
For me the decision is to go with their 400x400x400 V slot model with the 3rd Z screw option, just need the money which will likely push the order date out to June.
I've really had enough of Z screws I must admit...I'll look at the belt option harder in the meantime.
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Hi all.
Looks like my birthday's coming early, as I've squirreled away enough money to pull the trigger on a V-core kit.
I've been in touch with them with a million questions, and I must say the responses have been excellent, even including a call direct to my mobile in Australia from Portugal last night.
I was going to go with the 500x500x500 model, as it only costs a little more, but funnily enough the Keenovo mats almost double in price from 400 to 500mm, and it seems build surface options become much more limited as well.
They have offered that if I buy the 400mm model but pay the 500mm price (only about 20 euro more), they will extend the Z height to 600mm. I'm wondering if that will be worthwhile, or should I just go with the 400mm all round size?
I'm going with the triple Z axis leadscrew option, but without the motors as I plan to run a single belt/motor. I do wonder about their Z setup as they run 4 upright V slot channels with rollers, which may defeat the purpose of the triple leadscrews, but I'll look at that when the time comes. I'm still open to the possibility of a belt driven Z axis.
It comes with the 400mm build plate, but it's only 4mm thick. If it's flat that will be fine, if not I'll go with 10mm cast ally precision plate.
I've got a ton of gear here including a Duet wifi/paneldue, E3D V6, Meanwell supply, plus/wire...all sorts of goodies.
It'll probably take a long time until it's done, but I'm quite excited to get started. Also glad I didn't go the Tronxy route, as it seems they are a pile of junk for almost the same money. Cheers to those who advised against it.
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@Corexy congrats and happy birthday! An extra 200 mm in Z for 20 bucks or so, sounds like a no brainer if you can physically accommodate that height. Ref the linear guides, you only need 2 - maybe 3 depending on how they are arranged. The more you have, the more difficult it is to get them all aligned (although Vslot and wheels are a little more forgiving in this respect).
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@deckingman said in Large corexy mechanical kit options:
@Corexy congrats and happy birthday! An extra 200 mm in Z for 20 bucks or so, sounds like a no brainer if you can physically accommodate that height. Ref the linear guides, you only need 2 - maybe 3 depending on how they are arranged. The more you have, the more difficult it is to get them all aligned (although Vslot and wheels are a little more forgiving in this respect).
Cheers Ian,
Not literally my birthday, I just managed to accumulate the funds a little earlier. This might mean that I can get that Bondtech BMG I need for this project as a pressy....
That's how I'm thinking...they've got 4 vslot z rails and 3 leadscrews. I'm of the mind to make it a vslot rail with each leadscrew, possibly with the delrin backlash nut mounted mounted on the actual roller carriage plate.
I'm also considering a water jet cut all floor to mount the bearings/pulleys for belt driven z axis screws/pulleys. IF I don't go with a Digitaldentist style reduction gear belt drive for the Z.
But I won't get ahead of myself, as Ratrig seems to have gotten by just fine without my advice/assistance/opinions so far. I'll have a look at the thing first and take it from there.
As for accommodating this thing, I think it's own small table or roller trolley will be the way to go. It certainly won't fit on the workbench.
Cheers all.
**Order placed. Let's see how they go.
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@Corexy Yeah, I guessed that it was either a "metaphorical birthday", or an "official birthday" like the queen has.
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@deckingman said in Large corexy mechanical kit options:
@Corexy Yeah, I guessed that it was either a "metaphorical birthday", or an "official birthday" like the queen has.
Ha ha!
All my birthdays are metaphorical in a way, and it's hard to be happy on a day when you've just added another number to 5__.
I'm tipping the Queen gets more cards and a nicer cake too!
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@Corexy nah, 50 something is nothing. I find it scary that in 3 more years, I'll be adding numbers to 7. I'm planning on hitting 100 - then the queen (or king) will be sending me a card.
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@deckingman said in Large corexy mechanical kit options:
@Corexy nah, 50 something is nothing. I find it scary that in 3 more years, I'll be adding numbers to 7. I'm planning on hitting 100 - then the queen (or king) will be sending me a card.
That's one way to get her attention I guess?
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@deckingman said in Large corexy mechanical kit options:
I'm planning on hitting 100...
Just in time for the Duet 8.
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Little update...
It's been almost 3 weeks since placing the order, not dispatched yet.
I must say the communication has slowed/stopped (they answered a couple of technical questions since, but 2 emails asking about dispatch have been ignored so far) since payment was made.
I have no doubt it'll come, but I'm tipping there's a sales department that makes promises (like 1-2 weeks lead time) and signs them up, then flicks the order and his promises across to the production department. Not the first time I've seen that...
It doesn't bother me too badly as it's a long term project, but if it were to stretch out to 6 weeks I'll go for a refund. Hope it doesn't come to that.
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@Corexy Hang on in there. It'll come eventually. Looking back through this thread, I mentioned on 24th Feb that other people had said delivery was a pain time wise, but otherwise fine. Covid my be causing problems too. But I agree, it would be good if they kept you updated.
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Orders sometimes take a lot of time. Ratrig employees are active on the Facebook page (sorry), so they're not gone dark.
