Recently, I got my hands on a free Ender 5 Pro, whose Z axis was so bent it looked like a forklift drove over it.
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@3dprinting The wise among you might be scratching your heads right now. "How the hell is he planning to run dual Y _and_ dual Z off a Cheetah?"
Yes, that could be a problem for sure. However, I already figured out a solution to this, in probably _the_ stupidest way possible. I'll explain that next post.
Meanwhile, let's skip even _more_ steps and print the mirrored Y tensioner from Stage 2. Otherwise, I have a _very_ loose corner, and it bothers me.
30/n
@3dprinting To explain how on earth I plan to run 6 motors, we need to consider power. The Ender 5 comes with a single LRS-350-24, which is _definitely_ going to fall short with all my upgrades. I _do_ have an HS-250-24 lying around, which would give me the power I need, but the Cheetah only has one input for power.
The solution? Double up with the original board! I can run one with the LRS, the other with the HS.
Sounds crazy? Yes, but let me explain.
31/n
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@3dprinting To explain how on earth I plan to run 6 motors, we need to consider power. The Ender 5 comes with a single LRS-350-24, which is _definitely_ going to fall short with all my upgrades. I _do_ have an HS-250-24 lying around, which would give me the power I need, but the Cheetah only has one input for power.
The solution? Double up with the original board! I can run one with the LRS, the other with the HS.
Sounds crazy? Yes, but let me explain.
31/n
@3dprinting Given that the heated bed wants 220W, I can drive it from the original board with the HS-250-24. In addition to that, I can drive the E motor from that board, as the poor little 0.9 degree pancake I'm running there is 1A peak, which means something like 0.7A RMS. That's pushing my luck a tad, but _should_ fit into the HS.
32/n
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@3dprinting Given that the heated bed wants 220W, I can drive it from the original board with the HS-250-24. In addition to that, I can drive the E motor from that board, as the poor little 0.9 degree pancake I'm running there is 1A peak, which means something like 0.7A RMS. That's pushing my luck a tad, but _should_ fit into the HS.
32/n
@3dprinting _Everything else_ can come off the Cheetah, run using the LRS-350-24. This gives me four steppers, one of which has two motor connections. That means I have a dedicated driver for _each_ Speedy, and then I can share the garbage Zs.
I am a _touch_ bottlenecked given such mighty motors here. The Cheetah has soldered-on TMC2209s, which have 2A peak current, while the Speedys can tolerate 2.5A peak. This will limit their performance some, but hey, this whole build is jank anyway.
33/n
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@3dprinting _Everything else_ can come off the Cheetah, run using the LRS-350-24. This gives me four steppers, one of which has two motor connections. That means I have a dedicated driver for _each_ Speedy, and then I can share the garbage Zs.
I am a _touch_ bottlenecked given such mighty motors here. The Cheetah has soldered-on TMC2209s, which have 2A peak current, while the Speedys can tolerate 2.5A peak. This will limit their performance some, but hey, this whole build is jank anyway.
33/n
@3dprinting Now, my original plan was to have a swingout electronics box with a 7 inch touchscreen I had lying around. Obviously with all these boards, this isn't really viable anymore.
However, with those feet, we now have an actual electronics well, which _should_ fit both the PSUs and boards, just. Then, the swingout electronics box can just house the BPi running Klipper and the screen.
Easier wiring, less designing, perfect!
34/n
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@3dprinting Now, my original plan was to have a swingout electronics box with a 7 inch touchscreen I had lying around. Obviously with all these boards, this isn't really viable anymore.
However, with those feet, we now have an actual electronics well, which _should_ fit both the PSUs and boards, just. Then, the swingout electronics box can just house the BPi running Klipper and the screen.
Easier wiring, less designing, perfect!
34/n
@3dprinting With that in mind, I need DIN rails, as well as a way to cut them. Luckily, we can crib lengths from the Mercury One project, and I do have a local source for DIN rail.
Guess who is _also_ the proud owner of a new reciprocating saw?
35/n
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@3dprinting With that in mind, I need DIN rails, as well as a way to cut them. Luckily, we can crib lengths from the Mercury One project, and I do have a local source for DIN rail.
Guess who is _also_ the proud owner of a new reciprocating saw?
35/n
@3dprinting One rather _annoying_ aspect of the Mercury One is that their electronics enclosure (or well) has _zero_ documentation attached to it. No BOM, no instructions. While you _can_ get the CAD through their base Mercury One repository, this took me some searching to find.
I'll have to pull the CAD model to find out both what mounts they're using for their DIN rails, and how long said rails have to be. Nice to see this project _also_ apes awful Voron documentation practices.
36/n
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@3dprinting One rather _annoying_ aspect of the Mercury One is that their electronics enclosure (or well) has _zero_ documentation attached to it. No BOM, no instructions. While you _can_ get the CAD through their base Mercury One repository, this took me some searching to find.
I'll have to pull the CAD model to find out both what mounts they're using for their DIN rails, and how long said rails have to be. Nice to see this project _also_ apes awful Voron documentation practices.
36/n
@3dprinting While I wait for filament, I finally got the idlers I needed to finish Stage 1. I haven't bothered putting the pulley on the X motor, or belting anything, because I'd have to un-belt everything for later Stages anyway.
37/n
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@3dprinting While I wait for filament, I finally got the idlers I needed to finish Stage 1. I haven't bothered putting the pulley on the X motor, or belting anything, because I'd have to un-belt everything for later Stages anyway.
37/n
@3dprinting I also decided to try using my new reciprocating saw to cut some DIN rails. I wasn't particularly successful, as I simply could not workhold anything against this saw's might. Ended up using a hacksaw, some 3-in-1, and a lot of patience.
These are square and parallel, the camera just makes them look like they're not. Might change them later.
38/n
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@3dprinting I also decided to try using my new reciprocating saw to cut some DIN rails. I wasn't particularly successful, as I simply could not workhold anything against this saw's might. Ended up using a hacksaw, some 3-in-1, and a lot of patience.
These are square and parallel, the camera just makes them look like they're not. Might change them later.
38/n
@3dprinting One tip I got taught when doing tricky idler stacks involving shims: use a hex key to hold everything in place, then bolt down from the opposite end, displacing the key. This proved _especially_ useful here, as the thin shims I was using would have _certainly_ shifted otherwise.
39/n
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@3dprinting One tip I got taught when doing tricky idler stacks involving shims: use a hex key to hold everything in place, then bolt down from the opposite end, displacing the key. This proved _especially_ useful here, as the thin shims I was using would have _certainly_ shifted otherwise.
39/n
@3dprinting I also discovered that I did, indeed, have two flex couplers for lead screws, so I installed them too. The Z motors have _slightly_ different shaft lengths, so I will likely have to adjust them a bit. They look very cool if you give them a little nudge, as the springy couplers make them wave.
I can't do the rest of the Z assembly, due to missing 10mm rods. Until I get all the stuff I'm missing, I can't really continue.
40/n
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@3dprinting I also discovered that I did, indeed, have two flex couplers for lead screws, so I installed them too. The Z motors have _slightly_ different shaft lengths, so I will likely have to adjust them a bit. They look very cool if you give them a little nudge, as the springy couplers make them wave.
I can't do the rest of the Z assembly, due to missing 10mm rods. Until I get all the stuff I'm missing, I can't really continue.
40/n
@3dprinting Mounted the Y rails while I wait for parts. This is a bit of quite confusing documentation from the Endorphin project. According to the pictures, the written instructions and the CAD model, the right rail goes on the _outside_ of the frame. According to the instructional video, on the _inside_. So which is it?
Opened an issue about it: https://github.com/endorphin3d/endorphin/issues/31
For now I followed the video, so it looks a bit goofy. Can always remount once I have the printed parts.
41/n
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@3dprinting Mounted the Y rails while I wait for parts. This is a bit of quite confusing documentation from the Endorphin project. According to the pictures, the written instructions and the CAD model, the right rail goes on the _outside_ of the frame. According to the instructional video, on the _inside_. So which is it?
Opened an issue about it: https://github.com/endorphin3d/endorphin/issues/31
For now I followed the video, so it looks a bit goofy. Can always remount once I have the printed parts.
41/n
@3dprinting The Stage 2 instructions also aren't particularly specific on _where_ the rails are supposed to go exactly. This is definitely not obvious, as each rail is non-trivially shorter than the extrusion it mounts on.
For anyone reading this as an #Endorphin guide, it's 15mm from the rear brackets.
I might just go sensorless on Y and design some 15mm spacers/stoppers. Spoppers? There should be more than enough space there to M3x8 and hammer nut something in place.
42/n
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@3dprinting The Stage 2 instructions also aren't particularly specific on _where_ the rails are supposed to go exactly. This is definitely not obvious, as each rail is non-trivially shorter than the extrusion it mounts on.
For anyone reading this as an #Endorphin guide, it's 15mm from the rear brackets.
I might just go sensorless on Y and design some 15mm spacers/stoppers. Spoppers? There should be more than enough space there to M3x8 and hammer nut something in place.
42/n
@3dprinting More filament arrived today, which means more work on the #Endorphin. Several things have happened today.
First, rail stuff. I moved one rail to the outside of the frame, then designed and added some rail stops. These are both spacers (ensuring the rails are symmetrically placed), but also sensorless homing targets. As per the meme of this build, they fasten with M5 hardware, because what else.
These are fun to bump with the carriages.
43/n
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@3dprinting More filament arrived today, which means more work on the #Endorphin. Several things have happened today.
First, rail stuff. I moved one rail to the outside of the frame, then designed and added some rail stops. These are both spacers (ensuring the rails are symmetrically placed), but also sensorless homing targets. As per the meme of this build, they fasten with M5 hardware, because what else.
These are fun to bump with the carriages.
43/n
@3dprinting Next, we finally have a second Y tensioner! This is a redesign by me, because the original was held in place by _one_ screw, which meant it was neither holding the corner together (like the original tensioner) nor particularly well-constrained (as it could rotate around that screw). My design fixes both.
44/n
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@3dprinting Next, we finally have a second Y tensioner! This is a redesign by me, because the original was held in place by _one_ screw, which meant it was neither holding the corner together (like the original tensioner) nor particularly well-constrained (as it could rotate around that screw). My design fixes both.
44/n
@3dprinting Third, as you probably noticed, I restored the top front extrusion. While I admit it gets in the way, I simply could not justify not having it when I realized that I couldn't reinforce the two side top extrusions with corner brackets. This is because the Y belts would have nowhere to go then, whoops.
I stuck some small corner brackets on it just to be sure though.
45/n
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@3dprinting Third, as you probably noticed, I restored the top front extrusion. While I admit it gets in the way, I simply could not justify not having it when I realized that I couldn't reinforce the two side top extrusions with corner brackets. This is because the Y belts would have nowhere to go then, whoops.
I stuck some small corner brackets on it just to be sure though.
45/n
@3dprinting Last, but by no means least, I have replaced the toothless idlers with toothed ones for the Y idlers, and the idler opposite the X motor. These not only better match my colour scheme, but should also help with precision. Having to redo the shim stacks was a bit annoying, but ultimately felt worth it.
46/n
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@3dprinting Last, but by no means least, I have replaced the toothless idlers with toothed ones for the Y idlers, and the idler opposite the X motor. These not only better match my colour scheme, but should also help with precision. Having to redo the shim stacks was a bit annoying, but ultimately felt worth it.
46/n
@3dprinting Next on the agenda is completing Stage 2, which means mounting the two parts holding the X axis on the MGN12 carriages. The original parts have... _suspect_ belt clamping, so I'll probably test-print the parts first to check if they actually can hold a belt under tension. If not, I'll have to modify them too.
I'll also have to finally thread and tension the Y belts too, since those mounts will stay with us into Stage 3. This is the _easier_ belting step at least.
47/n
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@3dprinting Next on the agenda is completing Stage 2, which means mounting the two parts holding the X axis on the MGN12 carriages. The original parts have... _suspect_ belt clamping, so I'll probably test-print the parts first to check if they actually can hold a belt under tension. If not, I'll have to modify them too.
I'll also have to finally thread and tension the Y belts too, since those mounts will stay with us into Stage 3. This is the _easier_ belting step at least.
47/n
@3dprinting I also need to finish mounting all the reinforcing brackets, but for _that_ I'm going to need a lot more M5 fasteners. They are arriving soon. I'll also need to properly mount the Y motors (those mounts have quite a bit of vertical play at the moment), and most likely will need a _different_ reinforcing solution for the rear top frame corners, as my original brackets collide with the Y motor mounts. I have some options for those, but they'll need test-printing too.
48/n
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@3dprinting I also need to finish mounting all the reinforcing brackets, but for _that_ I'm going to need a lot more M5 fasteners. They are arriving soon. I'll also need to properly mount the Y motors (those mounts have quite a bit of vertical play at the moment), and most likely will need a _different_ reinforcing solution for the rear top frame corners, as my original brackets collide with the Y motor mounts. I have some options for those, but they'll need test-printing too.
48/n
@3dprinting Also, somewhat tangentially, I'll need to finish the Z axis. While I can't do this yet (still waiting on some key parts), this will determine a lot of other things, including where the electronics will go. I'll have to print some parts for this as well, but I decided not to even think about that until I have the rods and extrusion in hand.
49/n
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@3dprinting Also, somewhat tangentially, I'll need to finish the Z axis. While I can't do this yet (still waiting on some key parts), this will determine a lot of other things, including where the electronics will go. I'll have to print some parts for this as well, but I decided not to even think about that until I have the rods and extrusion in hand.
49/n
@3dprinting #Endorphin progress picture! I've (mostly) finished Stage 2 at this point: only the X tensioner remains. I've also added (and tensioned) both Y belts, which was a lot more annoying than I expected.
I did some other stuff besides, which I will explain in subsequent posts.
50/n
