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I made one and it looks good but it does not free up to move. I've been tapping it on a chopping block and squeezing it lightly in a plastic vice but it's sealed up tight. Any suggestions?
Photos 2 and 3 are my second try. Thanks for the suggestions, they worked!
I had the same issue when printing a different piece with moving parts, turns out I had the nozzle too close to the print bed, which wouldnt necessarily be an issue until printing items with moving parts that requires clearance gap between the pieces. Basically your nozzle is squishing the filament down against the bed closing the gap needed for the parts to spin free.
All you have to do is leave a larger gap from nozzle to bed when leveling your bed next, I use a piece of paper adjusting to where I can just barely start to feel the drag form the nozzle tip on the paper, I used to level my bed with a much greater degree of drag which I thought was needed for good bed adhesion, you want to create as large as a gap as possible but of course if you go too far you wont get good bed adhesion on your fist layers. Make sure to use a skirt around your part to prime the nozzle before the first layer, I have mine set at two 2 layers for my skirt and sometimes half of of the first skirt layer doesnt stick or print which I used to think meant my nozzle was set too high from the bed and would lower it and unknowingly squishing the print down, but dont worry if the first half skirt layer doesnt work, its just priming its self and totally normal, basically dont let this trick you into lowering the nozzle closer to the bed unnecessarily.
print again and set the horizontal expansion option to a negative number like -0.5 mm and try increasing this number until it you can free it
That works, no sticking at all and turned first time. Thanks.
Any pics of the new print? :D
Yes thanks for asking, the photos were added to the make.
Woah! Thanks for the quick reply, the new print looks amazing!
How would you rate it as a usable bearing though, on a scale of 1 to 10?
I'm thinking of trying to downscale them to a 608 bearing for a spool holder and want to know if they're reliable enough for practical applications.
It's not a usable bearing, I printed it as a demonstration piece just to show people as I mostly print flanges and mounts which people find pretty boring. The "spools" have no retainer which allows the surfaces to touch and since they are spinning counter to each other that's double speed and you get immediate heat build up and distortion. I tried to spin mine on a drill press and keep it cool with some silicone lube but it still sticks and grabs. Sorry.
https://www.thingiverse.com/make:360269 This one is 608 sized and works a lot better
https://www.thingiverse.com/thing:620185 This one works well too but is an odd size.
https://www.thingiverse.com/thing:2375124 This one works the best but is much larger.
All the best to you!
Nice, thanks for the thorough heads up! I'll definitely keep that in mind when making temporary bearings!