Anyone upgraded from one Bondtech extruder to two

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RiserDog
Posts: 65
Joined: Sat Jul 16, 2016 8:20 pm

Anyone upgraded from one Bondtech extruder to two

Postby RiserDog » Tue Feb 28, 2017 2:53 pm

I bought my N2plus with just one extruder. Was thinking of upgrading to a two, but using 2 bondtechs. Was wondering if anyone has done that? :?

Jetguy
Posts: 1659
Joined: Tue Mar 22, 2016 1:40 am

Re: Anyone upgraded from one Bondtech extruder to two

Postby Jetguy » Tue Feb 28, 2017 2:58 pm

Yes, that's what the kit is all about. It supports 2 extruders. The problem is, you need to buy the correct second motor if you do not have one to use the mini second option on the Bowden side, or opt for the QR Bowden side which includes the 5:1 special geared motor.
That in turn requires special hybrid firmware because you will have massively different steps per mm for each extruder (mini VS QR) and the "stock" firmware does not natively support such a configuration.

Jetguy
Posts: 1659
Joined: Tue Mar 22, 2016 1:40 am

Re: Anyone upgraded from one Bondtech extruder to two

Postby Jetguy » Tue Feb 28, 2017 4:19 pm

Again, the first thing to understand about the Bondtech is the naming convention they are using for their models of extruder.
The "mini" is a printed housing and gear set that reuses your existing NEMA17 motor, replaces the milled aluminum feeder bracket and V-groove bearing idler. This still does change steps per mm from stock 94 steps per mm to 140 steps per mm due to the drive gears being a smaller diameter. This increased resolution and torque along with the dual grip and lighter housing is a tremendous upgrade in so many aspects over stock.

The "QR" Bondtech was an extruder that was meant for other printers to be used in conjunction with either Bowden (remote tube) extruders or directly install an E3D V6 style hotend for a direct drive solution.

The stock dual extruder setup on the N series due the the 25mm spacing means that 2 side by side NEMA17 motors will not fit side by side. As such the solution was offset stacking them. This makes the center of mass of the entire moving head assembly well above the rods. The larger aluminum feeder block and the dual motors is significant mass. The Bondtech solution was to remove this extra moving mass by making the second extruder (right as left is primary) Bowden or remote tube fed. As such, the original solution was to use the QR to push the Bowden side and use the mini for the left onboard direct drive extruder. The issue there was that the firmware did not support 2 different steps per mm for 2 different extruders. So while you could set it for the direct side, you had issues with the mismatch. By keeping both extruders the mini design, this eliminated the steps per mm switching problem, but the fact remains, even though the mini is stronger than the stock extruder, when pushing through a Bowden, you have the added friction of the tube against all that filament so the QR is stronger than a mini.

Again, today, you have all the options as both solutions are supported. If you like maintaining identical extruder feeders and same steps per mm, use the mini as the Bowden and the normal mini as the primary.
If you don't have a second motor, you are upgrading a printer that came as a single extruder, then the QR gives you that second motor as part of the total package. Now thanks to other members working and developing the firmware- this option is much better supported than it was several months ago when first proposed.

RiserDog
Posts: 65
Joined: Sat Jul 16, 2016 8:20 pm

Re: Anyone upgraded from one Bondtech extruder to two

Postby RiserDog » Tue Feb 28, 2017 9:47 pm

Thanks for the info.


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