I designed and printed a 3D press fit pulley that has a really nice, snug fit in my abec clones, but it slowly slips out when weighted/riding.
This is already my second iteration of this pulley, so I’m trying not to waste too much more time/filament.
I thought about designing a seat for a regular 609 bearing with a lip that presses back up against the wheel, but I feel like the heat from the friction of the bearing on this seat will NOT be good for the material (in this case, carbon fiber PLA).
Is dumping some 5 minute epoxy through the opposite side into the spokes a bad idea?
The only other thing I can think of is putting a washer in between the 2nd (pulley) bearing and the seated lip, but I don’t know that that would make things any less melty.
In my experience the only material to use is Nylon for press fit pulleys. Any type of PLA is just not abrasion resistant enough. ABS works for a little while.
Imo a press fit pulley bearing should not really get hot… The pulley itself only sees load from the belt which, coupled with a nice bearing, should run nice and cold… Is the press-fit pulley bearing just floating on the axle? How is it backing out?
I’ve had good results with CF-PLA for bolt on, so I’m trying my luck with press fit. It’s a very very tight fit, but the belt still pulls it out. I did have my belts pretty tight though.
Yeah, it’s just floating on the axle. The alignment of my pulleys is pretty much spot on, but even still, I guess the belt is tight enough that it’s somehow pulling the pulley out of the wheel, despite being such a tight fit that I cannot pull it out with my hands.
I’ll try to design it with a seat for a bearing and see how that goes
Thats how press fits work
The pulley is directly pushed in by a bearing with a lip or larger bore. Its why thry require an extended axle, because otherwise all 3 bearings dont fit standard axles. You can make a design that fits a standard axle if you use a flanged bearing that is also wide enough to work as an inner wheel bearing at the same time
I’ve designed a similar setup. Using a 23mm OD 15mm ID bearing to rest the pulley on the truck. Easy to turn this into any 3M 5M whatever T gearing. All a test at this point, not tried on a board yet.
I have an Ender 3, which has been treating me very well. I’m gonna be installing a hardened steel nozzle, all-metal hotend etc (whenever they feel like showing up from aliexpress), so maybe after that I’ll try some other filaments.
