Hi Davew, Thank you for bringing that to my attention. I plan to use (obviously) tempered glass, which has a slight elasticity. As you said, weight is not so much of a problem, given the 4 Nema23 steppers tied to the lead screws. The screws themselves are single start, 3 mm travel, trapezoidal, from roton. I thought long and hard about backlashing, but given the low slope helix of the screw, I dby val c. - General
Hi ddentist, I don't know yet, December will be the month of calibrating and experimenting with it. From what I understand, layer thickness cannot be larger than nozzle diameter. I have several options here, given my dual extruder: I could go both 0.8 mm and be faster, or I could keep one 0.4 nozzle next to a 0.8 one, and do detail with the small one and infill with the other. I will know more wby val c. - General
Hi James, I plan to solve the flatness issue with a thick piece of glass (10 mm at least) and clamps. The whole thing sits on a framed bed cross braced in the middle, over which I added a marine (plastic) board 6.35 mm thick, bolted onto the frame. On top of the board sits a 1" cork mat, and finally, said glass will sit on top of that. Since cork has its natural elasticity, I believe edge clampsby val c. - General
about done building a 50x43x45 inch printing volume cartesian 3d printer. pictures attached.by val c. - General
i'm almost done building a printer with a 50x43x45 inch printing volume, since i don't have the kind of money to buy a big rap or a 3dp. you can see a couple of pictures of it attached.by val c. - General
Quoterhmorrison Quoteval c. ...otherwise one risks ending up smoking one's pencils. Would probably be healthier that way! 3d printing in asbestos, anyone?by val c. - General
Quoterhmorrison Actually, you only have to make pencil holders. If you want an ashtray just cut a couple of notches in it! Worked for me as a kid in the metal shop. i always maintained one should keep the pencil holders and ashtrays separate, otherwise one risks ending up smoking one's pencils.by val c. - General
Quotethe_digital_dentist All that time, effort, and expense, and for what? Now you're stuck with that impractical and uninteresting machine. Just think of all the Yoda heads and iphone cases you could have printed if you hadn't wasted so much time on that monstrosity. I'll give you $200 for it if you can pack it up and ship it to me. indeed, i should stick with making ashtrays and pencil holdby val c. - General
QuoteAndrewBCN Sorry, but this is just the N+1 post on the very same recurring subject, and to summarize what happened to the other almost identical first posts: people are never heard of thereafter, probably because after giving it a little bit of thought, they realize that building a large FDM printer is neither feasible nor interesting in practical terms. Just look back at the past posts hereby val c. - General
Quoterohitnalluri Hello All, I completed a Prusa i3 build in May, and now that I've gotten it to work well, I am thinking of building a larger machine, with a build area of 1 meter cube [1000 mm x 1000 mm x 1000 mm]. For this, I need your assistance and advise. Here's what I'm thinking (open to suggestions): 1. It won't be cheap. My budget for this is 2000 dollars, including shipping and importby val c. - General
@cheaptrick2 scaling up a moving printer bed invites trouble. I never understood why someone would want to make a moving part bigger, inertial forces are proportional to the mass of said moving part. if you want to work with larger beds, you might want to consider a minimal motion and take advantage of using gravity. for instance, if you hang your bed on vertical lead screws and use 'inverted zby val c. - Reprappers
hi n8bot, i do not have a dedicated thread of any kind, but i thought i should post a few pictures of my work to give you and others an idea. been working on it for 1 1/2 years now, as i said above, i'm working on the x axis and have just had my first setback after all that work, namely, the extruder carriage i designed and had cnc-ed in china, proved to be too fragile for my 2 pound all metal duby val c. - Reprappers
here is a fresh pic, platform (z) and y axis working.by val c. - Reprappers
the picture is a week old, i already have the platform on it, so far i dry tested the z and the y axis. after playing with the settings a bit, got them to scale. currently working on the x axis and the bed heating, then it's time for calibrating.by val c. - Reprappers
i'm almost done building a printer with a 50x43x45 inch printing volume, since i don't have the kind of money to buy a big rap or a 3dp. you can see a picture of it attached.by val c. - Reprappers
Hi Yaro. I was down the same path, whether should I use a 6 mm GT2 or something else. Eventually, I found a 10 mm gt2 belt steel reinforced, which I'm gonna use to move my 2 pound all metal extruder over 1000 mm of x-axis, using two 10 mm wide gt2 belts running in parallel. The reason I went with 10 mm instead of 6 is, I'm trying to avoid the guitar string effect. Wider belt, combined with steelby val c. - Mechanics
hi, i'm new here, this is my first time posting with reprap so please bare with me. that said, your choice of four lead screws is a healthy one. would it be possible to move the screws to the corners? after mounting, the screw takes on a structural role, stiffening the frame, and you could compensate easily for bed sagging. you might have to play around with some custom brackets, but the structby val c. - Extruded Aluminum Frames