Hummingbird Remix

thingiverse

First of all, I want to thank gzumwalt for such a fascinating design. I set out to simply alter the threading tolerance but found it necessary to change the tolerances of the bushings and gear holes as well. In total, I modified around thirty of the thirty-eight parts and added a hand crank since I wouldn't be using a motor. Initially, I used the hand crank designed by someone else, but ultimately decided to create a motor gear axle to ensure it stayed in place better. Most of the tolerances I changed resulted in a .4mm difference in diameter between Male and Female connections. As for the gears, I initially did not include bevels on the outside, but after modifying the compound gear to include a bevel cut, it worked significantly better. The bushings that go inside the gears were changed from 8.0mm to 8.9mm in diameter to make them slightly thicker, which required me to adjust the gear holes accordingly. Since I had to modify the base as well, I rounded the corners. There are two versions of the base available - one hollowed out on the bottom **Base_Mod_HollowBot_Rev9.stl** and one solid **Base_Mod_Rev9.stl**. The threaded parts were modified to use non-standard threading for better printing at .2mm layer height by changing the thread pitch from 1.0 to 1.25 & Thread_Angle = 40. To modify any of the openscad files that use the threading, you will need to download the threads.scad file from http://dkprojects.net/openscad-threads/. The settings for the threads are included in the **ThreadSettings.scad** file, so if you want to adjust the threading it only needs to be done in one place. After conducting some tests, I found that I could have used standard 1.0 pitch & 30 angle if I was printing them at .1mm height. I have included all the necessary parts for this design. Six of the parts remained unchanged, while the modified parts have _Mod in their name and an associated scad source file. If you are using the motor mentioned in the original design use **GearMotor_10_Mod_Rev8.stl**, if you are using **Crank_Mod_Rev6.stl** use **GearMotor_Axle_Rev8.stl**. Some things I might change if I reprint this include making the sphere on the Pivot_Wing slightly larger so the connecting rod stays in place better. It appears that there is enough room to make this adjustment. Additionally, I would add another screw where the bird's beak meets the body and pull the beaks together. This change does not seem to affect the gears. Please follow the instructions of the original design: https://www.instructables.com/id/Hummingbird/. One thing to note if you are using the Crank instead of the motor is to install **GearMotor_10_Mod_Rev.stl** before the gears around it, otherwise the fat axle will not be able to pass by the other gears. For my testing purposes, I modified the heads on the bolts to hex head so that they could be tightened more easily. The versions I uploaded have a flat surface on two sides of the round heads for tightening if the allen wrench hole does not work well. I also made two flat sides on the spacers inside the gears. There is an openscad file available for each part I modified in case you want to make further adjustments. If anything was left out, please let me know.