Something thats stuck on my mind: do these pulleys require modification on caliber II trucks (like enertion/evolve ones do?) or do they fit without (similar to the one Kegel design?)
Are there stl files for the snap is type of Flywheel pulley? Like Evolve’s design?
So I have not tried these on my caliber II trucks. The internal clearance of the lowest point on the nuts is about 23-24mm if I remember correctly. It might work without modifications. YOU DO NOT HAVE TO CUT OFF ANY PART OF THE TRUCKS THOUGH, like you eocwith the enertion pulley. Though you may need to round over the 2 sharp edges of the caliber II truck hanger for there to be sufficient clearance. Roughly about 3/4 of an inch deep from the end of the hanger.
2 Likes
There are no STL files for snap in versions ofor these pulleys. Here’s why.
The weakest point on a 3D printed part is the interplane bonding (between 2 print planes) the strongest parts are the intraplane bonding (in one plane.).
Knowing that, how do these pulleys have to be printed? With the pulley face down which results in the Retainer or the mating portions being face up. In such a way that the Retainer is being printed in the same plane as the shear stresses when it’s in use. So when you go to accelerate or even worse, brake, there’s a hight likelihood that if there’s a defect in print or say you’re a 180lbs rider using a mono drive that the forces acting on the pulley may exceed those of the interplaner bonds.
On top of that there’s actually a different pulley in enertions pulleys that you put into skate wheels. Main difference being there’s an additional flange that essentially holds the pulley up against the inside of wheel and prevents it from drifting over onto the hanger. You could in theory achieve the same effect with a 3D printed pulley but again the thin flange is taking a lot of forces as its all that prevents it from drifting apart from an extremely tight fit into the hub of the wheel.
Enertions and evolves pulleys are nylon injection molded and are capable of withstanding those forces for repeated use and abuse. 3D printed parts will pronably not withstand it very long. They may be able to if you print at 100% infill and you get a really good quality print. But I’m not betting your lives on it. If it’s not something I would feel safe enough to put on my own board I wouldn’t put it out there for you to put on yours.
3 Likes
If you could share any one solidworks file with me, I could make the snap in version quickly with space for bearing and everything.
I intend to print it from shapeways(nylon sintering method) and I am confident that it will hold up to whatever abuse I hurl at it. I have tried destroying it, it just doesn’t.
The snap in version is just so convenient that we shouldn’t just ignore it.
3 Likes
Wow awesome job, looking to print 40T for a 97mm flywheel clone. Thinking about using 3DHub using Taulman Alloy 910, any suggestions? This is going to be my first build so I’m still planning out parts. I’d still need the pinion pulley, is there any models for that?
1 Like
Any nylon filaments will probably be really resistant to wear so I dont see any issues with Taulman 910. The pinion gear though you should not print. It will have very few teeth meshing with the belt at any given time and so will wear very rapidly. On top of that you’ll have a lot strain being put into the material and if there is no keyway to distribute that across the whole length of the pulley, in which case youd use a set screw, youll also get excessive wear very quickly. Even with a keyway youre still going to have very rapid wear on the teeth so thats not a permanent solution.
Hey thanks for the files. I printed the 40t pulley to use on 97 mm Abec clones and the 10-24 2 1/2 screws were too short. Do you have the Cad files so I can adjust the depth of the screw nut. Also, would like to experiment with some thickness and design iterations and share my findings with the community. Thanks!
Great work! Is there any way to redesign them just a little so they do not require supports? Like the outside retainer just be flat all the way around down the the bed, and some tweaks to the actual pulley. I think good print quality can be sacrificed for some aesthetics. If you can’t, I’d be more than happy to.
What do you mean by “so they don’t require supports”? What would be the advantage?
I dont quite understand the concern here. All of these require a cavity for the nut or the head of the bolt to sit flush on the back and as such will require you to print with support. You CAN print these without support but the face that meets with the nut or bolts will come out a little messed up so I dont recommend it. But also the support on these is minimal, it doesnt add a whole bunch of print time or use excess material so again I fail to see the concern.
The brim is about the same size as the pulley apart from on the 34T because the pulley is much smaller than the cone on the back of the wheel so the cone is left as the same because these were designed to be reproduced quickly in multiple sizes so the matting portion of all these are identical.
As to sharing the cad files, I’ve mentioned before I dont like to. Much like @FLATLINEcustoms, I will share all my stls with the community but the cad files I chose to remain private. At least for now since there is still a few things I want to do with the series but havent had the time. Maybe once I’ve finished with them I’ll do a mass upload of source files but for now they’ll remain private. This is more of a quality control than anything else really, I want t make sure whats being put out there will meet the expectations we all and I put on these, my expectations being a lot higher then yours probably. because I spent a lot of time designing these to be adaptable to allow for this style of mass dump in a relatively brief period of time.
Edit: I made the comment that maybe I would upload the source files once I was bored of them but was not the message I really wanted to come across so I removed that from the original post. I have put a lot of effort into creating all these files,the abecs, mtbs, kegels and 107’s. If you count up the total number of source files its like 120 pulleys, that’s a lot of files to go back and re upload. There is still work I want to do on these to make them better and add another series or two is what I meant. Its time consuming and it’s something I would like to complete myself as it’s something I set out to do. There may reach a time i’ve had enough of pulleys for a lifetime and once i’ve reached that then we’ll see about source files.
1 Like
did you use these ones? Blank 83mm 78a Multiple Color Longboard Flywheels + ABEC 7 Bearing + Spacers | eBay if not could you send a link
here’s where i got mine (back end of 2015): http://www.ebay.com/itm/Blank-Pro-97mm-Multiple-Color-Longboard-Flywheels-ABEC-7-Bearing-Spacers-/151887095681
Those are the same ones that I bought. Wishing I would have gone a little bigger, but those 83mm ones have been working fine for me.
When you get them, make sure you put the bearings in and free spin them all. A couple of mine have a slight wobble to them that I’m glad I caught. Going 20mph+ on a naturally wobbly wheel doesn’t sound safe or right, so look for the one that spins the most straight and true and make that wheel your drive wheel (or wheels if you’re doing dual drive).
Today I totally wrecked my pulley after a few weeks.
This print was 200microns PLA but I don’t know what the infill was, I could not choose infill on 3DHubs, but it was too low obviously 
I’m going to reprint this but what printing parameters do you guys suggest from your experince, maybe print them with Nylon?
The pulles started breaking when the belt sometimes got over the flange, the flange broke and the tooths lost its support and everything flew appart piece by piece.
https://www.instagram.com/p/BLENUXIg1Aw/?taken-by=eboarding https://www.youtube.com/watch?v=m7KBsSSXt9w
I dont know what your infill was but you should be getting these at like 80+. I print mine at 100%
I printed mine at 100% solid.
1 Like
Oh, no 
Still printing pulleys? Price shipped to Cleveland Ohio?