squirrelf3d
patreon
Belted ender - dual Z bottom mounted motor
🕑 Added 2024-06-22 04:56:41 +0000 UTC-------------------------------------------------------------------------
Success!! 15mm Yellow spring worked great and red springs did too and are the final recommend ones, with nozzle on the bed, I'm getting a 118hz note when plucking the belt, and both belts are within 1hz of each other.
A "limited" model on printables - all thanks to my patrons, wouldn't happen without them!!
one axle option, one bearing option to keep it simple.
Full model + STEP: Download here
confirmed working release - In the shop (included with patronage)
Has additional bearing and axle size option, and of course you can send your requests.
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NO PRINT SUPPORT
I printed mine in PETG.
PLA might work except for the motor mount which will need PETG or better.
ABS and ASA are of course great for this.
make it a strong print:
- 5+ bottom and top layer
- 5+ perimeter walls
- 30+% infill
- recommend wall printing order to "inner/outer/inner"
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Two models
- dual individual Z (so 5 stepper needed), and run z tilt before each print (two nema17 32mm motor, so stock ender motors are strong enough to hold the X axis)
- Mechanically linked belts using a 230mm or longer 8mm rod (you can use the stock lead z screw), motors would share a stepper driver. You can also try a single motor, but not sure how well that would work, and a single small motor will likely not be able to hold the X axis when powered off
Hardware needed:
Attached BOM as an excel file
Common hardware:
- (2x) motors can be anything under 40mm in length if you want it to not stick out. Stock Nema 17 32mm motor work, but would recommend those 39mm motor: 17HS15-1504S-X1 (amazon) (stepperonline) / 17HS15-1504S1 (stepperonline)
Both are the same motor, just different connection, one with a plug, other only has wires. - (2x) 188-GT2 6mm belts (188mm is the belt length, it actually has 96 teeth) - Amazon
- (2x) long GT2 belts (2m or more, will actually need about 850mm for each belt on an ender3, longer for taller printer like 3max or extended z setup)
- (2x) Springs - 15mm yellow or red spring (stiffer) - Amazon Yellow - Amazon Red
- (2x) GT2 80teeth, 5mm bore, can be purchased (obviously more accurate) or can be printed and used with another set of GT2 20t 5b pulley — for bottom axle - Aliexpress or printed
Printed: GT2 20t 5mm bore pulley ( ones with grub screw ) — for bottom axle.
Get 20teeth 5mm bore: amazon link 1, link 2 — Aliexpress (make sure to pick 5mm bore) - (2x) GT2 20t or 16t on the motor ( I'm using a GT2 20T ) (rotation distance will differ, 16t will have 8mm rotation distance, 20t will have 10mm rotation distance)
- (8x) M3x8 — to mount the motor
- (16x) M5x8 screw and M5 t-nuts — to secure parts to the extrusion
- (8x) M3x8 — for belt tensioner
- (8x~12x) heat inserts, usual type ( m3, 4mm long and 4.6 or 5mm outer diameter) - amazon link 1, link 2, link 3(has reviews) - AliExpress m3x5x4 or m3x4.6x4
(mechanically synced z will need 12 of them) - (2x) M4x20 (up to M4x25) (yellow spring) — for belt tensioner
Red spring version would need M4x25 (up to M4x30),
(M4x20 might work with red spring but the tensioner will likely need to be lifted by hand a bit for the screw to catch) - (4x) M3x25 — for belt tensioner
Optimally used along with ptfe Bowden type tubing 4mm with 3mm inner diameter ( the type used for reverse Bowden ) Need 64mm, cut in four length of 16mm - 10m of 3mmID-4mmOD (amazon) - (6x ?) M5x40 for the V-wheel axles
- (3x ?) 8mmODx8.3x5ID spacers on the v-wheel axles (can be printed, file in the zip)
Bottom 5mm axle:
- (2x) 5mm diameter rod, 60mm long (can be longer but will stick out) preferably with a flat side — - 5mmx60mm Aliexpress (<-- what I'm using)
- (2x~4x) GT2 20t 5mm bore pulley ( ones with grub screw ) — for bottom axle.
Get 20teeth 5mm bore: amazon link 1, link 2 — Aliexpress (make sure to pick 5mm bore)
Get four if you are printing the GT2 80t pulley - (4x) 625 bearing — for bottom axle — Amazon AliExpress
Bottom 8mm axle:
- (2x) 8mm diameter rod, 60mm long (can be longer but will stick out) - Amazon
- (4x) 688 bearing (8x16x5mm — for bottom axle — Amazon
OR
148 bearing (8x14x4mm) - Amazon
Dual individual Z
- (2x) GT2 20 idler pulley 5mm bore for the top
- (2x) M5x16 as their axle ( up to M5x20 )
Mechanically Synced Z
- (4x) 688 bearing (8x16x5mm — for bottom axle — Amazon
OR
148 bearing (8x14x4mm) - Amazon - 230mmx8mm rod (or longer), you can also use the stock lead z screw
- 4 more threaded heat inserts
- (4x) M3x6
updated looks compared to first release:
Comments
Squirrelf
yeah we can brainstorm and figure something out for it. see you on discord!
David Alenhag
I just received the kit, the quality leaves much to desire. I believe I got the Dual-Z-F623 version. My intention is to use separate and independent z motors. I was hoping to be able to get a kit of sorts but never mind, I'll have to do this properly and go by your BOM. I am going to print those large 80 teeth rollers though(cost saving). I haven't written anything jet but I joined your discord in order to discuss possibilities of using this mod with a CR10S Pro V2. It isn't a great fit but I am prepared to disassemble the hole printer in order to cut holes through the case to expose the profiles. Se you in discord.
Squirrelf
which version did you get ? you'll be able to use some of the stuff from it (like belt, looped belt and pulley), then based on the version you'll be able to use the long rod (single motor), or the short ones (dual z) sadly won't be able to use any of the ball bearings. And which model would you be building? the mechanically synced one (with long rod) or individual z (requires 5 stepper drivers)
David Alenhag
I really like this, a few hours ago I went through ordering a kit for the POWGE kevinakasam belt mod, but this one is far more attractive. Perhaps I can utelize some of the parts of that kit. In case someone wants to know: https://www.aliexpress.us/item/1005003933709487.html
Squirrelf
new zip is up, has all the STLs with mechanically linked top, also added 148bearing option. Will updated it again with more renders and info soon
Squirrelf
I actually already included the bottom 8mm rod version in the latest zip, uses 60mmx8mm rods (can be longer will just stick out a bit, but nothing will interfere it) And now finish up the top mounted long rod model which I'll be posting that very shortly, which will use a 230mmx8mm rod (or longer, so stock lead z screw would work). 8mm rod on top can be used with 8mm or 5mm rod on the bottom. for the 8mm rod variant, each corner will need two 688 bearing (so eight total if doing 8mm top and bottom), and GT2 20t 8mm timing pulley (so four total with 8mm bottom and top axis) The non spring version works great and was tested (was just a bit annoying to tighten the belt, not hard but just require a lot of tiny turns of the hex tool). And I currently have the spring version on my printer also working great. (going to test other springs that will be delivered tomorrow)
Gialan Tonthat
I've been long hoping for a dual-Z belted bedslinger upgrade with bottom-mounted motors since I first saw it implemented on the LH Stinger: cleaner build, lower center of gravity from fast-print shaking. Can you have part variants for8mm rods at both the bottom pulleys and top via 1 long 8mm rod? From my experience with Kevinakasam's belted ender build, you can mechanically sync the top pulley section with the stock lead screw rod (8mm diameter)
Squirrelf
yes it would too, but with individual stepper driver you can do a z tilt before each print to get it back aligned. And with single stepper, yeah would be between the two top pulley, which will require some 8mm bore pulley, and some 628 bearing (or something along those line), will be an easy tweak after this first version is done, so I'll likely have it ready within a day or so after.
TryingtodomypartY
I'm not saying 'pull and tighten' is the right way to go I was just wondering. I have built a Voron and KevinAkasams mod, and they both have a method to tighten that driving belt. Voron uses a simple lever which pushes the motor into the right position and therefore tension. Kevinakasam uses a screw mechanism to alter the position of the motor.
marc gautsch
with 2 drivers if power off the alignement could go away too. The sync you mention could be a road between the to pulley on the top from
Squirrelf
Regarding the small belt on my initial prototype and as rendered you'd slip the belt like a bicycle chain, but will change it to pull and tighten.
Squirrelf
It would work but could go out of alignment when the motor are powered off, once mechanically sync that wouldn't be an issue anymore and definitely can share a stepper driver
TryingtodomypartY
Not gonna lie, I'm itching to start printing on this mod. I've got most of the BOM already but have ordered the missing bits already.
Squirrelf
Oh right, it's 188 2gt 6mm
TryingtodomypartY
I can't see any method to tension the belt running over the 80t and the motor 20t pulleys. Is it just pull it tight and clamp it down? Also the tenative BOM above is missing the 6mm timing belts; I'm estimating 2 meters of GT2 belt and 2 looped belts of unknown length...
marc gautsch
For Z motor if you avoid Z tilting possibility a A stepper board with Y splitter could do the job No?
marc gautsch
Nice setup avoiding leadscrew
TryingtodomypartY
same - top mounted dual z from kevinakasam. The only issue I've had with it is the method the belt is clamped and tensioned on the back, it has failed a few times for me. However my printer is currently out of commision so this might be a fun project to restore it to a working state.
Bill Gilliland
I'm running Kevinakasam's version but definitely liking this design better
