Biqu H2 Extruder Light Weight High Extrusion Force Not Easy to Block Good Heat Dissipation Control Sensitive 3D Printer Parts Can Be Used with Creality Ender and Cr Series Printers

OK, so this is going to be a wall of text. As such, I'll put the TL;DR version right here at the start: Early production quality problems notwithstanding, this is a *fantastic* all-in-one direct drive extruder/hot end assembly, capable of printing even the softest TPU's at previously unheard of speeds.With that out of the way, let's dive into it...Early production units of the H2 suffered from horrible QA problems. BiQu knocked these issues out, though, and currently available units do not have those issues.Early production units also shipped with the extruder wiring harness plug located at the bottom of the unit. Once again, BiQu listened to their customers... currently shipping units have the plug located at the top of the unit.Let's cover a few quick potential "gotcha" issues.1. Retraction speed. I was having a hard time getting my retraction settings under control. As instructed by BiQu tech support, I set my retraction distance to 0.5mm, and my retraction speed to 4.0. That is NOT a typo... the retraction speed they recommended I tried was FOUR. Not forty. Four. I thought there was no way that was going to work, but it did work, and it worked well. My final retraction settings for PLA: 0.5mm retraction distance, FOUR retraction speed, 40 de-retraction speed.2. Yes, it is normal for the H2 to click a bit during retractions.3. Don't forget to calibrate your e-steps!I have been running the H2 nearly 24/7 since I installed it three weeks ago. It has performed flawlessly with every filament type I've thrown at it.I only have one significant gripe, and that's that at this price level, IMO it should come with an all metal hot end, allowing you access to the BiQu spec of printing at up to 500C. Unfortunately, it does ship with a PTFE lined heat break, limiting you to around 250C max printing temp. The all metal heat break isn't expensive, but shipping is so SLOW to get it.I also had a very interesting (if not slightly confusing) experience with BiQu's tech support. Honestly, I'm so torn on the experience, that I don't know if I should complain or praise them. Here's what went down...So four days after I ordered the H2 here from Amazon, I got an email from BiQu, stating that they had been informed that my package had been damaged during shipping, and asked if everything was OK.In fact, the box *had* been damaged, and unfortunately one small plastic bag that contained two grub screws and a few other M3 sized screws was missing.While it was very nice that they proactively contacted me about the fact that my package had been damaged, and asked if everything was OK, things went downhill from there fast.For some reason, I could NOT get it through to them that I was just missing the small plastic bag that contained the grub screws to retain the thermistor and heater block, as well the M3 screws used to mount the H2 to the printer. Five rounds of email were exchanged, and in the end I just gave up in frustration.Let's just chock it up to a very, very, VERY frustrating language barrier, but try as I might, I could NOT get them to understand that I was simply missing the one plastic bag that had the mentioned screws in it. Realizing I wasn't going to get anywhere with them, I just sourced the screws from other places, and got on with my life.While it was nice that they proactively contacted me, the fact that in the end they weren't able to perform the simplest function of sending me a few missing screws is beyond aggravating. So I guess we'll give them an "A" for effort, and an "F" for performance.All in all, I have zero regrets with the purchase, and I love the H2 unit itself. It's also nice that BiQu is listening to their customers, knocking out QA problems, and at least ATTEMPTING to provide some level of customer support, even if it fails in actual execution.IMO, the BiQu H2 is one of the nicest upgrades you could put on your printer. Just be advised that you're going to be mostly on your own, as there are no instructions included, and the company's ability to provide support is very limited.

Once it arrived - I was surprised by everything that come with it. Heater and temp probe with wires. Some have said that the wires were a little short, but they were plenty long for my Ender 3. The BIQU H2 V2S Extruder is not plug and play. You will need to print a mounting bracket - there are many different versions out there. I love the dual metal gear direct drive all in a very small compact package. It is almost as light as the oem setup. I had no problems mounting and wiring. Getting the e-steps calibrated did take a little while. The manual recommended to start at 932. I actually ended up at 2200 when I finally got it really dialed in. I also had to re-tune the PID settings for the hotend heater. I have been printing PLA mostly and switching to PETG this works much better than the oem bowden tube setup. Currently retraction settings of Speed @ 4mm/sec and distance @ .4mm. Some have complained about clicking but I haven't had that problem. So far I have used PLA and PETG. With the PETG I am getting much cleaner prints, no stringing as I did with the oem bowden tube setup. PLA printered well for me with the original bowden setup for several years, but I wanted to transition to PETG and the BIQU H2 V2S Extruder is working really well.

Purchased this for an Ender 5 Plus running Klipper. After a few tuning missteps, I finally got it dialed in and it seems to be printing reliably. A few note for those running Klipper: I set my rotational distance to 3.433 and my pressure advance to 0.040. These will probably change for a different printer, but they should be good starting points.It clicks pretty loud on retractions. I relubed the gears, slow down retraction speed and set retraction distance to 0.5 mm. This seemed to quiet down retraction noise, but it's still present. There seems to be some lash in the gearing that's making the noise, but it is retracting. Time will tell if this becomes an issue.

UPDATE:I FINALLY received an update from BIQU. Instead of shipping the unit, as they stated they would. They waited 5 months and said please send us a video of it being faulty. It would have been nice if they lead with that. My printer has been dismantled for months and canibalized for other parts while waiting on BIQU. Frankly this is ridiculous. Not happy with BIQU, it to the point where i will likely cut my losses and move on to better printers.UPDATE: It's now August and despite being reassured by the customer support team that they would address this and get me a new unit sent - I am STILL waiting. Fortunately I have other 3d printers so I am still chugging along with my printing hobby, but its frustrating waiting this long for a replacement...It took a little while to get going on my ender5 pro. I needed to print a mounting plate, and then needed to print duct for a cooling fan. Inconvenient, but not too big a deal. The the printed mounting plate introduces some slop into the carriage. I used a ABS like resin to print those parts, and its help up well. What I DON'T like with the extruder is the lack of mounting holes. There are only 2 per "face". I feel like I can never get it fully secured.Once over these hurdles I finally got it working and printing nicely. (did take a little time to sort out the esteps. I managed to go through a couple rolls, then I had a major failure. The kind where the filament blobs up and encases the entire hotend, nozzle and in this case even some of the extruder.I reheated the hot end, and was able to carefully remove *most* of the caked on PLA. but the extruder never worked as well after that. It started under extruding. I checked for clogs, then disassembled the unit to check for obstructions. But still under extrudes.I manually feed filament through it seems to flow nicely, but whenever it prints it seems to lose its grip. As it will feed fine, then inexplicably stop feeding (the gear is moving). This has happened with multiple filaments.Very frustrated at the moment, as I really want to like this extruder. I will reach out to BiQU for support, and will update this review if they can help.

I had a lot of experience with Sprite extruders which work well, on my Enders. Then I bought a Sovol SV04 with subpar stock extruders and couldn’t handle it so I went for a Biqu H2 and it did not disappoint.It extrudes muuuch faster and more consistently than my stock extruder did. I haven’t done a side by side but it seems like it would run circles around sprite extruders too. Plus it’s nice that the tensioner locks open for loading, though it is slightly more difficult to get the filament down through the gears and directed into the nozzle. I interpret this as less free space for my filament to get jammed in and that’s a positive aspect so worth dealing with a little bit harder to poke it in.The dual gear drive was EXACTLY what my original extruders were missing and needed so badly. Even with floppy TPU being shoved through a big 0.8 nozzle at high speeds, it rips. No jams. Can’t wait to do some flow testing and upgrade to a Bondtech CHT nozzle and it’ll really fly.I was impressed with the completeness of the package, had all cables and even most of the screws needed to get it together. Really I only needed to add screws for my duct fan, everything else was included.Obviously this is not a plug and play upgrade. I 3D printed a mount for the Biqu to fit my printer, and a fan mount and duct as well. The servo wiring was the same as my stock extruder so I left it where it was, and just had to run the two fan cables and thermistor and heater cables. All were plenty long to reach my ribbon cables breakout board on the gantry, though I had to get the correct JST terminals for my printer and solder all four connectors.In Klipper, the setting changes were minimal, just changed the ratio to a number I found in a write-up and PID tuned the new hot end and I was off to the races. I had to recalibrate my X Y and Z offset for proper positioning on the bed, then it could run any of my old gcode just BETTER.I will almost undoubtedly be buying more of these. Great product.