This is interesting. I have a large printer (720 x 320 x 400) and the spool holder is in the center, off to the side. What's happening with this machine is as the printer makes various large movements, any material that has been tugged off the spool can cause a tangle, snag or filament can fall over the side of the spool. It's not a bowden system (direct drive) but I'm debating on a good way to help the filament move off the spool cleanly.
Interesting. I thought friction was just a function of normal force and the coefficient of friction. Didn't realize that the surface area came into play.
You may be right and I confess that I'm not an engineer. To my (perhaps flawed) logic, if you are pulling an object on top of top of two parallel rails, you'll require less force than pulling that same object over an entire plate of the same material. But if I knew for sure then I'd probably be an engineer rather than a hobbyist. Notwithstanding that, I believe the filament holder I designed achieves a not insignificant reduction in friction by using PTFE for one if the mating surfaces. What do you think?
@@PrintableScience Alan is correct. The formula for friction is F=µN. F is friction, µ is the coefficient of friction, and N is the normal force.The surface are does not affect friction. I really do like your design, btw.
good idea, alternative to the ptfe is to use the back side of the double-sided tape, the slippery stuff, it works great for me
This is interesting. I have a large printer (720 x 320 x 400) and the spool holder is in the center, off to the side. What's happening with this machine is as the printer makes various large movements, any material that has been tugged off the spool can cause a tangle, snag or filament can fall over the side of the spool. It's not a bowden system (direct drive) but I'm debating on a good way to help the filament move off the spool cleanly.
Brilliant.. Awesome design.
Thanks. :)
Interesting. I thought friction was just a function of normal force and the coefficient of friction. Didn't realize that the surface area came into play.
You may be right and I confess that I'm not an engineer. To my (perhaps flawed) logic, if you are pulling an object on top of top of two parallel rails, you'll require less force than pulling that same object over an entire plate of the same material. But if I knew for sure then I'd probably be an engineer rather than a hobbyist. Notwithstanding that, I believe the filament holder I designed achieves a not insignificant reduction in friction by using PTFE for one if the mating surfaces. What do you think?
@@PrintableScience Alan is correct. The formula for friction is F=µN. F is friction, µ is the coefficient of friction, and N is the normal force.The surface are does not affect friction. I really do like your design, btw.
Great design.
Thanks. Lots more to come! :)
I love the idea!
Thanks very much! :)