as i just explained on the Fusebox thread, i've had to redesign the carriage so that the belt locks are detachable / replaceable / reprintable. i'm using M2 pozi bolts and hex nuts because that's what i have, but the principle could be adapted to use anything up to M2.5 bolts. basically what you do is, put the belt grabber 1/2 way into its slot, then drop an M2 bolt with its hex nut into theby lkcl - CoreXY Machines
Quotepen25. but those darn ears are curling up on me and breaking off. one more thing to mess with. ok if you're referring to the first layer not sticking, such that the fine detail of this design's parts are curling up, then may i suggest that you add a "brim" of around 5mm. i also use a heated bed *and* unscented hairspray. i'm developing a libre eco-conscious laptop: some of the parts are 2by lkcl - CoreXY Machines
Quotepen25 well the gap is 1.2mm and only .7mm from tooth to edge on the original design. the one i edited is 1.8mm edge to edge and 1.3mm tooth to edge. i just printed it and the belts fit fine. and they are the 6mm belts specified in the bom. my belt measures 1.8mm on the calipers.and i just finished printing this new one and belts fit perfect. but those darn ears are curling up on me and breakby lkcl - CoreXY Machines
Quotepen25 one thing i noticed about the carriage. i have printed it a couple times. and had a friend print it. seems the belts dont fit in the slots. i have modified it and about to print it to see how well it works. i measured my belts and they were wider then what is designed on the stl. if it works i will upload it. just occurred to me: you *need* 6mm width belts. if you're trying to fitby lkcl - CoreXY Machines
ok so here's the z-assembly, you can see the upright and folded arrangements - i had to do quite a bit of PLA cutting and filing, to get those to fit, i'll sort out the CAD to match what i had to do, but at least i have a working folding z-assembly which is the immediate requirement. FAM - the bed ain't going anywhere. there's no play in the bearings, and the friction on all six hinges is so stby lkcl - CoreXY Machines
Quotepen25 I have also modified the y rod ends as they werent holding up. how did you all deal with the belts? and did anyone else have problems with the y rods? ok here you can see the alternative y-rod arrangement, with the motor assembly sitting on top of it and keeping it down: this is an earlier iteration, i've since replaced this, but you can see that i have an extra piece of plastic oby lkcl - CoreXY Machines
ok, sorted - you can see the motor's inboard by around 40mm, and there are two more idler bearings that turn each part of the belt through 90 degrees. i slightly messed up how close the belt gets on the outer bearing, i'll correct that shortly -there's plenty of room to do so. yay!by lkcl - CoreXY Machines
Quotepen25 one thing i noticed about the carriage. i have printed it a couple times. and had a friend print it. seems the belts dont fit in the slots. i have modified it and about to print it to see how well it works. i measured my belts and they were wider then what is designed on the stl. if it works i will upload it. I have also modified the y rod ends as they werent holding up. how did you aby lkcl - CoreXY Machines
hi, ok so i have a heck of a lot of 3mm PLA because i have a mendel90, so in the fusebox-derivative that i'm creating i had to get an E3D v6 3mm bowden extruder, which came with a bowden tube at 8mm OD as part of the kit. i printed up the direct-drive extruder parts in the fusebox zip archive... and.... i was not impressed. the load on the extruder arm was so high that i couldn't install the sby lkcl - CoreXY Machines
okaay so all the components arrive.... start assembly of the top corexy... can anyone spot the deliberate mistake? yeees, that's right - i brought the damn y-rods in too far, argh, so that the belt is at an angle instead of straight. argh luckily i was designing something where there are 2 bearings which make the belt (both bits) turn 90 degrees, and the motor(s) are *inboard* by about 40-5by lkcl - CoreXY Machines
QuoteFA-MAS I might suggest looking into a design that folds the bed upward. rright, slightly ahead of you here - i've been talking the "folding-upwards" idea over with a friend (over about 2-3 days). if you have pretty much the exact same design (angled supports) then no matter what you do, you're going to have play in the bearings. what we came up with was this: turn the z-assembly roundby lkcl - CoreXY Machines
QuoteFA-MAS The pictures are pretty much how I envisioned it'd work and I like the way the casing would work. I was also thinking about the collapsible print bed. I might suggest having it fold the opposite way from what you're planning. Reasoning being is that it's already cantilevered, and the bed itself and any weight put on end further from the rods may cause it to sag. right. that's whby lkcl - CoreXY Machines
QuoteFA-MAS How about placing the Z axis assembly on one of the squares of your support structure (lets say blue assembly), then you could eliminate the need for those extra extrusions to support it on it's own and also not have to worry about how you're going to attach/detach it when you're setting up/tearing down. . hi FA-MAS, i mentioned i liked this idea, but couldn't think at the time how iby lkcl - CoreXY Machines
ok here's a link to the photos: FA-MAS, i've taken close-ups of the various joins - they're wing-nut-based, i'm not totally happy with all of them, in particular i thought it would be a smart idea to make a single piece of plastic that joins together both the top of the z-assembly (vertcally) with the back of the top assembly (horizontally). turns out that this is a _complete_ pain for gettingby lkcl - CoreXY Machines
ok so progress so far is that i have all the components ordered except for wires and connectors, and i have the frame (box, zassembly, topcorexy) 100% completed except for: (a) filling in the panels in the diagonals (b) clips for when the box is stowed (c) critical corner-braces for the topcorexy assembly. now, i bought hardboard to fill in the panels of the box halves - it was simple to source,by lkcl - CoreXY Machines
QuoteEdvardas This is close and probably even better than lm8luu but it comes at a price. wow those look great - look at the figures, 800N somethingsomething that's 80 times gravity. i note they even have something on the side, presumably so you can oil them in situ. it's a pity that they're not drop-in replacements for LM8LUU - they're also a bit longer (54mm) and i'm looking specifically toby lkcl - CoreXY Machines
QuoteJ-Max You should consider also Igus Polymer bearings, which are quieter with less play IMHO. ++JM briiiliant, thanks. for the z-axis arrangement less play is important with this design, much appreciated. [2nd update - sorry j-max, clarity only comes sometimes by comparison: zappautomation only have LM08UU (aka LM8UU) bearings - i'm specifically after the longer LM08LUU (aka LM8LUU).by lkcl - CoreXY Machines
btw does anyone know of a european supplier of the LM8LUU bearings? all the EU suppliers i've found so far only have the LM8UU smaller bearings.by lkcl - CoreXY Machines
Quotermrf QuoteAx Just a quick one, Misumi EU is based in Frankfurt. So you can actually order direct. I basically did that for 2020s. Did you buy through company? Misumi EU seem only to work with companies. i'm getting 1515 extrusion frame through makerbeam.com (openbeam) as well as the corner brackets and corner plates. i'll be hand-cutting the 1m lengths to the required size.by lkcl - CoreXY Machines
hi alex, i thought you might appreciate knowing that i'm creating a derivative of the fusebox, called the "foldable sandwich 200". as the name suggests, it's a foldable, portable 3d printer - there aren't very many of those out there. one thing i've done is raised the XY components up - the y-rod mounts are now on *top* for example - and the motors are on the outside edge not the inner edge. iby lkcl - CoreXY Machines
QuoteFA-MAS How about placing the Z axis assembly on one of the squares of your support structure (lets say blue assembly)... i liked this idea! so i thought about it seriously, here's what i thought would be problems: wires. my main concern would be that the z-assembly and topcorexy-assembly would need to be separated (not hinged or attached), and that would mean heater, thermistor, x, y andby lkcl - CoreXY Machines
QuoteFA-MAS I'm interested in something like this. cool. well, when i'm confident with each assembly i'll let you know, i'll be buying bits very soon, i am on a rather tight deadline. Quote Though my reasons would be easy storage rather than travel. I'll be moving into a very small place and there won't be room to have a printer out permanently. yeah my brother got a laptop - a large one - fby lkcl - CoreXY Machines
QuoteEdvardas Do you need 200mm of printbed space on Y plane? i definitely, definitely need a full 200x200 range. the reason is because i am printing parts for the EOMA68 15.6in Libre Eco-Laptop that i'm developing, and the longest parts are 230mm x 16mm x 12mm. the diagonal of a 200x200 is 280(ish) mm. so, i'm targetting a full 200x200mm range. height is no big deal for me, so i'll be happyby lkcl - CoreXY Machines
Quotethe_digital_dentist A few dumb questions: there are no dumb questions - only reaally dumb answers Quotethe_digital_dentist Is your folded version any more portable than the printer you started with? ohhh yeah - most definitely. the fusebox is.. what... a cube approximately 450 on a side? this is *150*mm high when stowed. i might even be able to manage 120mm if i'm careful, but givenby lkcl - CoreXY Machines
QuoteEdvardas How big is the printbed? same as the fusebox - 200x200. i chose that design to copy because of its low cost, clear BOM, and that it used primarily 3d-printed parts. the disadvantage (not really - more like a surprise) is that the empty space surrounding the bed is, for a corexy printer, really really large. i keep looking at it and i keep wondering how it would be possible to reaby lkcl - CoreXY Machines
if anyone's interested i'm doing a foldable, portable 3d printer that is based on the fusebox (a corexy design). i will be moving every month for a year, to a different country each time, developing an eco-conscious laptop and i cannot be without a 3d printer. if anyone's interested do contact me. outer dimensions of the box when stowed are 457 x 405 x 150mm. CAD design is being developed here:by lkcl - CoreXY Machines