3D printed in-frame Motor

[Föppel]

Ou shit, i wrote you a long answer on my phone, and its all gone now

In short; i am very happy with the Q2, also in regard of first Layer/Bed probing. But i have to say that i dont print nearly as much "hot" stuff as you do

I heard about the (initial) problems of the Plus 4, did you get yours early?
I got my Q2 after things were working out, but you can see (in my Review Video) that there were also Problems early after release, and that Qidi made 2 or 3 interations before i got mine.

Thanks for the interesting Infos about the PA, so i will use the Cryogrip Plate from BIQU with some adhesive to make the Fan-Turbine thing

Oh and here is the link to my Review/Comparison of the Q2 if you are interessted

 

[scianiac]

Nice review, yeah certainly I'm not buying a QIDI that was just released. I asked around it looks like the Q2 has no problem bed probing at high temperatures. The nozzle may actually use a load cell instead of a piezo sensor so it's not as sensitive to temperature. Does make me wonder about printing directly on other materials, a technique I've always wanted to try. Printing TPU/nylon directly on nylon fabric to make armored/padded garments or something like that. Reliable bonding may be tricky for many materials but something like printing polycarbonate bits directly onto a sheet of lexan or something. How you align the lexan may be a pain, might have to cut the lexan sheet out after you've added your printed sections and use those for locating.

 

[Föppel]

Sounds very interessting, what would be the usecases for that?

Haha yes, buying a printer directly when its new released is never a good idea nowadays even my Bambu Lab P2S was no fully ready and missing things (like exhaust filtration)...

 

[Föppel]

okay, did a test ride today, everything works, but many things to do and change

When installing the pedals, there was almost not enough clearance between the Pedal and the Motor Pulley...

J

there's just enough room for one hair in between... so i have to install a wider BB.

I attached the controller temporarily; It also needed a bit of tape to keep the cables from getting tangled.

I testet it with a 14S5P Pack from the backpack and set it to 10 amps max. so about 500W.
Next time will be 1000W, then 1500W and so on. Between the tests i will adjust Stuff and try to solve problems that certainly will occur with increasing torque, speed and heat.

To Goal would be 2000 to 2500W power, but i am already happy with the ~30Km/h that i got with 500W

You can vote now by writing your guess, at what power the whole thing blows up

 

[scianiac]

Long BB or shorter cranks, I always like the shorter cranks. I put shorter cranks on my Small Block build, think they were Jitsie trials cranks and at least when I bought they they weren't that expensive for quality cranks. You're also so close you may be able to shim the BB over slightly, I had to do a fair bit of shimming and tweaking, maybe still more to do to get everything to clear on my fat bike Big Block build.

 

[Föppel]

Oh i did not think of that, good point
Yesterday i set up the VESC, and skipped 1000W but set it to 1500 W for a test ride... Everything hold up fine, the Motor was pretty hot at one point (able to touch it only for 1 Sec).

I am also not sure if i set everything correct in the VESC Tool. I will post some pictures later of my settings, maybe someone with more experience with VESC will spot something that i messed up.

On full throttle, that thing accelerates quick
But when applying only a small amount of throttle, the Motor "stotters" a bit, till it gets up to speed. That is the only thing that i am not happy with so far, and i think it is something in the VESC Settings.

 

[scianiac]

How's the gear ratio? Did it work out to really let the motor spin but still get the top speed you want?

Yeah there are lots of ways to improve the low RPM/current motor tracking, that is always the thing with traction motors, getting that tuned. VESC should be fairly good with that type of motor but I only have experience tuning hub and IPM motors with VESC. At some point though I decided it's easier to just do every build with an encoder from the start, just gets rid of so much potential tuning issues and the only real cost is the mounting, which is real easy with 3D printing and the wiring, which is mildly annoying depending on the VESC.

To install an encoder you have to give up the integrated fan I think, unless you find more space or get everything real thin. Or actually you can probably put the encoder sort of inside the fan, the encoder can be pretty small. If it were me and this is a whole lot of redesign so may not be worth it I would go with the encoder and use an external fan, install two temp sensors in the motor if it doesn't have any, one for VESC to limit the temp so you can push it hard but not worry and one for a fan controller so the fan only runs when needed. A fan controller with a variable output would be ideal and one of those tiny server fans that go like mad. That will move way more air than the fan on the motor probably and only use power and make noise when it's needed. Yes I have thought about how I would do a build like this before.