Price, availability of decent ones down the line, and allignment has to be absolutely perfect with linear rails or otherwise they won’t move.
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I used them before, and Igus polymer ones definitely are worse in this case. Even with a very slight misallignment they would bind like crazy, and it is pretty much impossible to get it perfect on something like this that has 8x bearings for the bed.
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Hmm, I can see that. It would be nice to have some sort of fine adjustment mechanism to make the alignment perfect. I’ll try to keep that in mind if/when I design my own printer.
I ended up spending about 4 hours loosening pretty much any bolt related to Z axis, carefully realigning, and then tightening bit by bit one at a time. Now there is pretty much no resistance even at low speeds. The bearing are a bit noisy, but the Z axis will barely move at all, and the printer will be completely enclosed which should take care of some of the noise.
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Ah fair enough. I didn’t realize there were that many. I suppose it was different with just 2 or 3
Super bad ass.
Why a HEPA filter vs just venting out the window? I was under the impression that a HEPA filter doesn’t do much if anything against the toxic particles from ABS.
I thought the point of a HEPA filter was to filter the particles out
I think most filters don’t filter small enough particles to be useful in this context. Activated carbon might work… That sounds like a pain though. Much easier to just remove the contaminated air than to try and clean it.
I really don’t want to have a duct coming out of the window, as I’m trying to make it to look as clean as possible.
Using a combination of a HEPA and active carbon filter seems to be pretty easy though, and that should be enough. Something like this would cost under £5: https://www.thingiverse.com/thing:2105113
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I have been extremely busy lately, and haven’t had much time to work on it. I have added the X axis, X carriage and the belts. However not a huge fan of how some parts are designed so I might take it apart and redesign them
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I ended up building pretty much everything in one and a half days where I had a bit of free time, so I did not really document the building process.
It is working quite well, and the Duet web interface is quite nice. Only thing is that I need to replace the linear bearings, as the current ones are quite bad and slightlly rusty, and when moving them with no belts I can feel something that I would describe as small steps.
Here is what it looks like inside:
There is a lot of free space inside. I really overestimated how much space the electronics were going to take, so if anyone has an idea of something useful I could do with extra space feel free to share your ideas.
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If you inclose the sides, put in a carbon air filter system, have the intake airflow go over the electronics if possible for cooling.
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Okay, so upgrade time. I had to keep my acceleration and jerk quite low to avoid ringing (500mm/s^2 and 5mm/s), so I ended up getting linear rails for both X and Y axis. 3x 500mm MGN12H Hiwin rails ended up being slightly over £100, but they’re worth every cent as I currently use 15 jerk and 2000mm/s^2 with pretty much no ringing visible. I also upgraded to 9mm belt instead of 6mm, as the belt I originally had was quite low quality, so I was going to upgrade it as well and the price difference between 6 and 9mm is small.
The extruder still has the same specs as before, I just redesigned it to use less horizontal space to allow for a larger effective work area.
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So you have an estimate for the total money spent on this? What’s the build Volume?
What would you do differently if you were to build it from scratch.
Would love to see pics of print from the printer. Including the old ones with ringing.
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What a coincidence! I’ve been looking into corexy designs, and saw this on thingiverse! Has no clue it was one of us. Very interested in this design
Looks lit 
How much budget approx? That’s a 500x500mm printing area?
I haven’t kept track of the total, but from memory the frame kit with basic electronics was about £400, Duet with screen about £100, linear rails £100, other small parts like better belt, idlers, extruder, Misumi Z bearings, Sunon and Sanyo fans, 0.9 degree steppers about an extra £150, acrylic for electronics £30, acrylic for complete enclosure £110 (haven’t installed them yet). So total of about £890 (£780 without a full acrylic enclosure that I haven’t installed yet).
If i was to do it again from scratch, I would definitely start with quality linear rails as large printer and direct drive wasn’t very rigid. Also probably I would advise to not save on linear rails and get proper Hiwin ones, as in the end the price difference is not too bad (£35 for a Hiwin and £20 for a generic 500mm MGN12H one).
Will take some pics for comparison a bit later.
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It is roughly £780 like in pics, with an additional £110 worth of acrylic left to be installed for a full enclosure.
I originally planned a roughly 400x400x400 printing area, but I ended up with 380x388x370mm, which is still quite a lot and anything this size would take ages to print.
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