SUNLU Official Filament Connector, Fast Heating Filament Connector for 3D Printer Filament 1.75mm, Up to 240°C, Compatible with PLA PETG TPU ABS PA Nylon, Easy to Use, Pack with 200PCS PTFE Sleeve

I use a Bambu P1S, and this thing is so nice to have for all the little runs of filament you have left over after clearing a jam from your extruder. Initially, it IS a little awkward to use when you have to hold both ends together in the PTFE tube and also close and open the top of the heating element, but it really is not that big of a deal as people make it out to be.The included 200 PTFE tubes is quite generous considering you can just slide them off and reuse it again for most splices. So, cutting them would only really to be used for splices between another incredibly long run of filament that you couldn't be bothered to pull it through on.All in all, a really handy little tool to helps prevent waste.

No more wasting that last couple of meters of filament. Being able to clean and attach it to the new roll means that the waste is gone. Now if I could only find a price sensitive filament maker from my scraps.

Good concept. Can be hit or miss. Too much heat or not enough heat is going to be an experience thing. Like most things you get it takes time to feel comfortable. Once you get the hang of it you have endless possibilities on how to arrange your colors together. I found that cutting the filament on an angle works best. Lots of reviewers cut the filament square. Follow the instructions. It shows cutting it on an angle. Best piece of advice I can give, be patient.

This is amazing. First seen it on Uncle Jesse youtube channel and he had kinda mixed results. I have so many spools with 20% or less and I'm getting yelled at by the wife. First time using i read and followed the directions... and it was perfect. I mean you couldn't see where the fused connection was. Going to start just filling spools.This is a must have for the part time to full time printer...

Not sure if the instructions make sense but it took about 10 tries to get it right. You’ll get a lot of what I pictured until you get a process down that works for you. Here’s what worked for me. Plug in the into and open the heated portion. Let the temp come up for recommended filament. Center your 2 pieces of filament in the tube and place in the heating element and close the lid. Gently apply pressure on both sides to press together. It doesn’t take much pressure. And it only takes a few seconds to beep. Continue to apply light pressure when opening to heating part. Gently remove the filament while trying not push too hard or pull apart. That’s the tricky part. It’s also challenging because the rolls or bend of the filament want to fight you the entire time lol. Blow on the tube section to quickly cool. Again, try not to push too hard or pull apart. It’s kinda easy from there as all you need to do is cut the tube off. You gotta finesse the whole process but your mileage may vary compared to my experience. Aside from that, it works but just not as easy as advertised. Is it worth $45??Not sure yet. 3 out of 5 stars for me. Good luck.

Well, I'm extremely disappointed. I waited months for this to be released and then waited a few more months and finally bit the bullet and ordered it. Let me just tell you right now, nothing about this machine is worth the price you pay. I'll start by saying, it's not all that easy to use. I watched the instruction video Sunlu provides for it, and also several other videos about the unit, and I was definitely able to get it to splice, but definitely not easy like they show. First off the main reason to buy this would be to combine left overs to not have waste. For that, it works, but the filament is not straight like they show in the video. Trying to hold two pieces of filament in the little ptfe tube and put it in place and press down the heat press all at the same time is not easy, especially when they have that end of roll curl to them and are nor straight. You also have to cut around a 45° cut on both pieces and then mate them together in the ptfe tube like a puzzle. So you have to attemp to hold them in this orientation while doing everything else I just mentioned. Once you get the hang of that it's not awful to get done. There are also lots of printed helpers out there but I didn't use them. Next let's talk about the ptfe tubing. They are horrible. They are so very thin (assuming for the heat transfer of things) that they get easily deformed. So easily in fact that about 35-40% of mine were ruined straight out of the package. Once they are deformed, they are no good as they will no longer create the "perfect" diameter they claim they will have, because the defect will transfer to the filament. This also makes it pretty much impossible to properly reuse the tubing. The other thing is when the lid clamps down on the filament and tube, it leaves a small indent on the melted filament, also ruining the "perfect diameter" they claim to make. No matter how hard I tried, there was no way to get a perfect splice with a proper diameter. The instructions they give are to cut the ends at roughly a 45° angle, puzzle them together inside the tube, put the tube in the heater and shut the lid, hold pressure for 1-2 seconds on both ends by pushing them together, wait for the beeping, remove and let cool for 5-10 seconds, then cut off the tube. This does not work. First off, if you let go of the pressure, it does not splice and will break right away. So what you need to do is hold that slight pressure the entire time. Next, when you push open the lid of the heater, it flings open. This has ruined numerous splices for me as it ripped the ptfe tube right out of the heat channel. Next you have to continue to hold that slight pressure for the next 5-10 seconds until the filament hardens. It doesn't take long but you need to find that sweet spot to where you have enough pressure to hold it together but not so much pressure that you bend and ruin the splice, as it's still soft. After that you need to wait like 2 minutes for it to fully cool off before you remove the ptfe. Anything less than that, you risk ruining the splice. Once you finally have all of this kind of dialed in, you can finally use the filament. However let's talk to printing the filament. Once you get all this done you do manage to get a decent splice that won't come apart. The diameter will be nowhere near right but at least it's strong enough to hold. So you go to roll the filament onto the spool. Lol, yeah right. Maybe if you are joining a few decent length end pieces, but not if you are making your own color change filaments and have multiple splices (the other use they claim this can be used for). I put together (20) 100mm pieces of material to try and make a rapid change filament, took about 2 hours and I couldn't even put it on a spool. I just wanted to print a benchy. Once it got that much pressure the splices failed. So I finally just fed it to my printer and printed the benchy out and let the filament dangle from the back and hoped for the best. Stood there and helped feed the filament (60mms print) in so there wasn't too much drag on the extrude gears made it about 45% of the way through the print and I thought, okay, this was bad but at least it did what I bought it to do, even if the effort wasn't worth it, it was printing okay and the splices technically worked. Figured at worst was good for joining leftovers in bigger portions. Then it happened. The biggest thing I was worried about, it completely clogged my nozzle when a big splice hit the hot end. Ruined the print and wasted around 3.5 hours of my night. I tried. I really tried. I wanted this to be awesome, but this is truly a waste of time. I won't even risk using it just splice leftovers. Definitely going to check into others.

Works as it should just follow easy instructions and your golden

Have only used it a couple of times, but it has performed exactly how it is suppose to. Happy with my purchase!