Prusa i3 mk2S mk2.5S Y Belt Tensioner no disassembly required
Description
Made this Y Belt tensioner for 5mm idler pullies , after looking at a few different designs and thought they were lacking stability the way some of them tensioned with one screw gave it potential for alignment issues or belt wobble or required you to disassemble the frame to install, so had a play around with a few ideas and printed a few versions before this final model . I have only done a few prints with this on now its really new but it has improved print quality and i think its far better then some of the other designs and i may create some other versions, give me a like if you give it a try as i spent quite a lot of time designing this, I may improve the design so feel free to give me feedback . You will need : 2x M4 bolts 30mm and nuts 1x dual bearing idler with a 5mm centre hole This design clips in so you dont need to disassemble the frame, and yea its tight so you need to put it in pretty close to the right alignment because it does not move very easily, basically lift up your frame at the front and hook it on the bottom rod , swing it up and it locks in place , then attach the arm , you can preinstall the idler and you will need to insert pin B then push in the nut as you cant put in the nut before the pin is in the nut wont fit through the hole and serves to lock in that pin which you want to sand so that it moves in the hole but is still tight . Make sure your print is clean and that the idler can spin with out any resistance , there is a 5mm pin for the idler which is super tight you might need to give it a light sand but you want a tight fit , alternatively you could use a M5 20mm bolt with a lock nut , if its tight its pretty unlikely to come out it has no forces on it in that direction but if worried use a m5 bolt. Printing is relatively easy i printed in PETG with 30% infill and supports for the base and arm, the pins i printed standing up and didn't need any supports . So if you don't understand what is going on here the adjustment bolt goes through two pins the pins actually twist a little as the angle changes rather then being sloppy holes it keeps everything tight and the bottom of the arm has a very solid pivot point , also when the arm moves in closer to the full tension it is supported either side to stop twisting . It worked well for me i hope someone else finds it useful as well. cheers.
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