BIQU H2 V2S Extruder

This is the most put together system I have yet to try. With very little tinkering I was able to get this configured and printing at relatively high speeds and quality using the provided information and datasheets. I have around 500hrs of print time, and I have not had a clog, skipping, or wear. The filament path is pretty optimized and can print even 65 shore hardness tpu with ease. Speeds are good with a volumetric flow of around 15mm3/s The fan is seriously silent and I haven't had an issue with heat creep. The entire thing is metal and even after a few bed crashes it is still holding strong. The m3 holes allow a ton of mounting options for all the accessories you can want. There are a ton of mounting options on thingiverse and community designing almost any attachment. Overall a very reliable and easy to install design with plenty of community support and good speeds

Bought to replace a H2 V1 that had jammed so bad it was totalled. Jammed up non-stop from the start using PLA. After hours of trying to make it work, I just replaced the whole printer with a Bambu and am printing now rather than replacing crap parts.

Update: 1 year later I see quite a few negative reviews of the BIQU H2 V2S (not the Lite version). After about 20kg of various PLAs my unit is still functioning well. The gears aren't worn. It still grips the filament as it should. What's changed since my original review? - Second Z-axis lead screw + stepper - Switched from Marlin to Klipper Still a 5 star product. Clearly, your mileage may vary. For me, I'm glad I bought it. Original review: My Ender 3 printers are almost stock. The only things I've upgraded I printed myself. Namely, I printed a better spool holder, and a filament guide. I also use glass or FR4 as my print surface. The Ender 3 (original) has performed nearly flawlessly for a few years. So why did I buy this upgrade? I have had 4 particularly annoying spools of PLA. About every 3 feet the filament would snap - it was oddly brittle in those places. The Bowden extruder didn't help matters. That's it. That's the whole reason for the upgrade. I just got annoyed having to dislodge the piece of filament in the Bowden tube, and feed it back in again. I had to pick a direct drive because I want to have as little fuss reloading filament as possible. The H2 weighs only 216g, which was important because I wanted to drift as little from the original extruder setup as possible. Direct drive extruders are, by nature, heavier. All I had to do was print a mounting plate and a new part cooling duct and wire it all in. I've seen a lot of reviews about this particular extruder that go all crazy about balance and instability because there are only two screws holding it on the mounting plate. For my installation these criticisms seem to be conjecture, and unfounded. The H2 extruder performs perfectly fine after tuning your settings (more on that later). There is also criticism about the gears, the bearings, the metal used, and on and on. All I can say is, it works as advertised. I can attest to it functioning well. Maybe those armchair metallurgists are right and this thing will wear out after a while. For now, it works. About those settings. I use Ultimaker Cura as my slicer. If you're going from the Bowden extruder to this direct drive extruder, you're going to want to change a couple of settings. Outside of Cura, you're going to have to update the extruder steps/mm. From the LCD: Configuration -> Advanced Settings -> Steps/mm For this extruder, it's 932 steps/mm. Don't forget to save the settings from the LCD - under the Configuration menu. In Cura, Under "Travel" (see attached image): Enable Retraction - checked Retraction Distance - 0.5 Retraction Speed - 5.0 + Retraction Retract Speed - 5.0 + Retraction Prime Speed - 5.0 Minimum Extrusion Distance Window - 1.0

Mounting the hotend and nozzle is a bit awkward as its solely held by the heatbreak grub screws. So you need to grip the block to tighten the nozzle, but the thermistor and heater make it hard to use their included wrench. Would be better if you could grab the block longways. In use it performs well. The heatsink fan is very quiet. But there is a noticeable click sound every time it retracts, like a computer mouse. I don't know if its normal but it doesn't seem to affect my print quality. If not for that it would be an easy recommendation.

I haven't installed it yet, but first impressions it looks great. I took it apart and inspected all the parts. The machining looks great, the gears run smoothly. No binding. They must have corrected whatever the V1 binding issues were. The gear is now plated, which makes sense as you will be touching it and would cause it to corrode. I don't see much need for the release lever as you can just spin the gear to feed in or out, and it isn't like a Bowden where you have 200cm of filament to extract. A few swipes is enough to pull it out. I do wish they have better brackets and fan ducts provided on the BIQU site. Unfortunately I will need to design my own, and I have an E3. There is a poor design available that uses the factory fan. If you are upgrading to this, getting a better fan and duct should be assumed. I look forward to getting it installed and wish I had bought a few more when discounted, for a multi head machine build.

The extruder works great and has been giving me solid prints from the beginning, but when I tried to replace the nozzle the one that came with it broke off inside of the heat block.

I got this thing to work for one test print before it jammed. I cleared the jam and followed the instructions to fix the extremely loose and wobbly gears. After this, jammed immediately again and this time could not get even the highest temp to get it to extrude or reach the filament to pull the jam. I attempted to remove the heatbreak and extruder but the tiny lock screws were all completely stripped. I know the biqu h2 is known to have a lot of problems but holy s@#$. I'm not sure if I just had the worst possible luck in getting one with every known issue but I am completely turned away from buying this brand of product again.

The quality and build of this part is impressive. Very lightweight for a direct drive hot end extruder. The heatsink is also substantial. Nice bit of kit, give it a go.