Rex Roach's video: 3D Printed Prox Switch Dropper for Mr Bullet Feeder

A 3D printed part for the Mr. BulletFeeder to use a proximity sensor. Fusion3D file here: (this is NOT the file you upload to the 3D printing service) https://a360.co/2QWP0DL Download .stl file here: https://drive.google.com/file/d/1E1bPQfI6kwmH7cTatxhJL5XAKuqzLyZK/view?usp=sharing Upload the .stl file to here for printing: https://print.all3dp.com Use mm for measure and Multi-Jet Fusion as the process. Currently $23. NOTE: You will have to clean the threads for the sensor with an M18 X 1.0 tap. If you have to drill the hole any, use a 17mm drill. You might can use a 21/32 which is slightly smaller, but the plastic material should work with that. Rough sketch of electrical hookup https://drive.google.com/file/d/15NnV97zDsTUdA52C-dFRR3MYKXz3S97i/view?usp=sharing By request I've added a 9mm version. Here's the .stl file https://drive.google.com/file/d/1VlzQ0wd-IWHvZB0tpyt3PRrPPqE8b6Lm/view?usp=sharing Uploading and connections will be the same for the 9mm as for .223 FAIR WARNING: I have not ordered the 9mm version so I can't say with 100% certainty that it will work. But there's very little different, so it should be OK. Price as of 01/20 is $30 which includes black and polish. Prox Sensor https://www.amazon.com/URBEST-Detecting-Distance-Inductive-Proximity/dp/B01M1777XK/ref=sr_1_4?keywords=proximity+sensor&qid=1557166334&s=gateway&sr=8-4 Relay https://www.amazon.com/PACK-AMP-Waterproof-Relay-Harness/dp/B074QV54V1/ref=sr_1_12?keywords=automotive+relay+5+pin&qid=1560573050&s=gateway&sr=8-12 Use 1/4" push female connectors on the relay Connect the two Mr. BulletFeeder wires to 30 & 87a on the relay. They should already have the 1/4" connectors from where they were connected to the trip switch on the feeder tube. Doesn't matter which wire to which tab. Connect the +12 Wall-Wart to 86 on the relay and BROWN on the prox sensor. You can crimp them together in a 1/4" push-on connector. Connect the -12 Wall-Wart to BLUE on the sensor. Use butt-splicer or solder and shrink wrap. Connect the BLACK sensor to 85 on the relay with 1/4 tab. The wires are small, so you may need to solder them to the push-on tabs. The wall-wart can be 9–12 VDC. The prox sensor will work with less than 9, but I doubt the relay coil would reliably work below 9 or so. If you only had a 6 VDC power cube, give it a try before buying something else. It takes very little current to operate the sensor and relay, so very small power cubes will work.