Extruder Bowden ReprapMJ Type Mostly Printed and Easy to Make and Use

thingiverse

This is a modified version of the ReprapMJ 3990953 two hardware extruder, with the addition of four screw holes that enable it to be fitted to most standard brackets and NEMA17 motors. It's extremely minimalist and straightforward to print and assemble. Moreover, it's incredibly easy to use and work with. The design is based on the principle that there's no tension when not in use, provided you remember to turn the lever off. Filament can be fed or unfed without fiddling around with springs and other components. It can be left "on," but if made with PLA, it will gradually lose tension over time. I've left mine under tension on numerous occasions – I'm getting older, after all! – and still have enough adjustment on the cam to apply more tension as needed. Yes, I've forgotten to apply tension when trying to start a print quite often, to be honest. However, I always catch it in time because I routinely use three loops of skirt to check the nozzle is clean, and I watch the layer thickness to ensure the Z-axis is correct all around my object. There are two short clips below featuring a ReprapMJ using the screwless version while making this new 4-screw type and also being used with nylon. If you take a closer look at the full ReprapMJ, you'll see there's a fully printed version which I may also add as a screw-on type if there's sufficient demand – let me know in comments. The fully printed version works with PLA only and isn't recommended for long or costly prints, but it's great fun to watch it working (I spend far too much time watching 3D printers!). Advisory Note: Be aware that this extruder requires a functioning printer to print one. I suggest not waiting until your old printer breaks before deciding you need to make one! Personal Note: If you like this thing, please take the time to click the like button. I've uploaded a small collection of things which I think range from useful to frankly stunning (okay, I admit I'm biased), but my sad and minimalist collection of likes is looking pretty lonely so far – you folks are VERY hard to impress, and I'm feeling very unloved right now!