so...I watched your video and ran out to buy the Loctite Ultra Gel. I put it on a test piece and held it together for 1 minute, then let it sit undisturbed for 5 minutes - total negative bond. Total waste of time and money. Maybe you have a different kind of PLA than what I have?
Clock motors are fun, I have built a few out of PLA. I have not used the Loctite 401. I will have to give it a try. All of the loctite and CA glues I have tried have produced negative results. The best method I have for reliable connections of PLA printed parts is with a soldering iron. Its a bit tricky and you must be steady and very careful, but with a good pointed tip and a little practice, the joints I have made with this method are rock solid and dependable.