Gallery, Projects and General > Project Logs
Sheet Metal Brake and 3d Printer.
S. Heslop:
--- Quote from: WeldingRod on October 17, 2018, 05:05:17 PM ---D'oh! I forgot the attachments are on top! Yeah, you want the top level!
The bottom plate is for the z zero prox. I'll take a pic tonight.
Mine has been cranking on a print for two days straight, after the first 36 hour print finished... full scale, here I come!
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--- End quote ---
I'm really dreading those multi-day prints. I was dreading them already but reading about electrical fires from all the strange high amperage Chinese boards made it worse!
Got two of them drag chains in. Of course they gotta come back out for me to have any hope of getting the cables through. I'll probably tie them to a thin steel rod and drop that through.
One to go. Just figured out where i'm gonna squeeze it. The machine is oriented as is for easier access to the interesting parts, and I figured i'd have it rotated 90 degrees in the end since that Y bar gets in the way. But I neglected to notice till now that the belts also get in the way. So as it is is probably the best orientation for easy access to the parts.
It's also interesting, to me at least, that the end pieces of this cheap drag chain is more what I anticipated - but the chain itself is made from a very tough glass filled plastic.
Finally, I need to consider how i'm going to house the electronics. I could slide a board into the upper groove on the base extrusions, and have a compartment isolated from a potential heated chamber in the future. But that won't give easy access to the electronics. And speaking of fires...
Maybe I could put a board in that groove, but also stand the whole thing on some 50mm tall stilts, then mount all the electronics to a tray that can drop and slide out.
Anyways either way, hopefully tomorrow i'll have it wired up and ready to blow some stepper drivers!
WeldingRod:
Here's the bottom plate of the print carriage
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WeldingRod:
Once your bot is running properly, overnight prints aren't a big deal. You might want to add a filament run-out sensor; my last epic print took about 48 hours and spanned three rolls of filament. If it runs out and the bed hasn't cooled, you can just stop it, pull the SD card, lower the head till it just touches the last extrusion, and delete everything from the gcode file before that layer height, then tell it to print. That way you keep the zero point!
Cable chains are CRUCIAL to long term printing; glad to see you fitting them! You have to be sure those dratted wires don't get caught! Yes, straight chains are MUCH easier to thread. Use fine stranded wire in them, BTW!
I run mine in the same orientation you are using.
I highly reccomend having a spring loaded build plate. That way if you crash into it it can move away and maybe not booger up stuff too bad. Ask me how I know... https://madmodder.net/Smileys/default/confused0068.gif
My brain and power supply lives in the left corner of the base frame. You can slip a piece of fiberglass in on top of the base cross bar and screw it down to create a cavity that is partially isolated from the hot cavity.
Mine has feet screwed into the bottom of the Z rails that raise it a bit.
I think I've posted pictures of the Z before, but here's a fresh one. I had the X and Z cable chains as one continous chain, but connected backwards at the X/Z junction so they bent the other way. The flip happens at the one with the "X" on the side. The end of the Z chain is a leftover plate that I bent to shape. I might have had a few laying around ;-)
S. Heslop:
I was considering a spring loaded build plate just to make adjustments easier, since I wouldn't need to trap the plate between soft washers. I decided it wasn't a good idea since I might need some hefty springs if I decide I want to produce a solid block to the machine's maximum volume, but I didn't consider the idea of the head crashing.
Got the Z axis chain installed now but not much else. I thought i'd do a quick temporary repair of the steel cold water storage tank by sticking a glob of epoxy putty on it. I figured it might be low pressure enough that i'd get away with it, but I ended up spending all day trying to drain and dry the system out enough to get some on. Might still not work but this tank needs replacing anyways. I'd be happy if it lasts a week.
S. Heslop:
Was dreading this since I kinda knew it'd be the fiddliest part of this. What I neglected to consider though is that loaded with wires those chains weren't going to flex as easily. Especially since I got shielded cable! Had to fiddle with the Y axis chain to drop it down a bit, but now I need to add a couple more segments to get the full Y travel. Also lost about 20mm of Z height.
Still gotta extend the Z axis stepper motor cables and add a few end connectors. Should hopefully have it running tomorrow. I think I said that a couple days ago...
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