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ABS Sun Gears for Emmetts Automatic Tranmission Model

by zaaphod, published

ABS Sun Gears for Emmetts Automatic Tranmission Model by zaaphod Dec 13, 2012
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Summary

I had very bad curling problems while trying to print the sun gears in ABS... the overhanging cone in the center kept curling up and then the extruder would hit it. I realized it only curled away from the brake tab, because the brake tab was holding it from curling. So as a solution, I added 2 more brake tabs, I also widened the small part of the cone just a little bit to reduce the overhang distance. I also had problems with the gear teeth curling up from the platform, so I printed them with a brim in slic3r and that solved the problem, trimming the brim off was not too hard, as I made it wide enough (6mm) so I could just grab it and pull it away from the gear. This is posted as a work in progress because I am still printing the rest of the parts to assemble this and I'm not completely sure there will be clearance for 3 brake tabs, although it appears to be fine in openscad.

Update: I have my transmission model finished and assembled and these gears are working great with it!

Instructions

Print these Sun Gears with 3 Tabs when using ABS. These were printed with a single extruder head pausing and changing colors after layer 5.

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I was having similar issues with Glow in the dark PLA.. I have to print it quite hot to get it to extrude cleanly for solid infils and the like.

I tried pushing my bed temp up with little success, I'll print this version and see how I go.

Good thinking.  Too bad ABS isn't easier to work with.  I've pretty much given up on it in favor of PLA.  Nice that such simple addition can make such a difference.

I have a lot of ABS, and I don't have temperature control for my heated bed yet, and it's too hot for PLA, so I thought I would just see what I can do with ABS.  I also want to eventually make some gears and timing pulleys to put on fairly large stepper motors and I think they will be running too hot for PLA, so this is good practice to see how to print gears with ABS.   As you can see I have a lot of colors of ABS to play with too.  I must admit the curling with ABS can be very annoying

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