E3D Tool changer and Motion System - ODrive as Stepper alternative for 3D Printer


#1

E3D are releasing a “Tool changer and Motion System” as the basis of a 3D printer that you then add the control board etc. too. Could people who have used ODrive for 3D printing give advice on what works best for such a system. The stepper on the Z axis isn’t very tall is there anyway of using ODrive here ?

https://e3d-online.com/blog/2018/08/20/e3d-tool-changer-and-motion-system-beta-30-incoming/


#2

I had the same idea when I found out about odrive last spring. but looking thru the forum looks like using bldc motors in 3d printer isn’t that popular.

Maybe someone can help me out with picking out a motor, I don’t have any experience with bldc motors so this is new to me.
I’m currently in design phase for a Core XY printer its belt driven with 20th pulley. I want to use bldc motors for XY movement and the reason behind this is to decrease time in the none print moves.

Can some one give me advice in the calculation to selecting the needed motor


#3

I would suggest to use the ODrive Motor Guide. I entered 40mm/rev (20 tooth gt2 pulley), 24V bus voltage and 200g moving mass.
image

Then looking at the Trajectory tab:

You can see that it seems like for these input parameters, the D5065 270kv motor is likely optimal.

You can take a copy of the motor guide spreadsheet and play with the parameters.


#4

I’ve just bought some of these as they are half price today.
https://hobbyking.com/en_us/turnigy-aerodrive-sk3-6364-213kv-brushless-outrunner-motor.html

Hopefully I will be able to fashion an adapter to make them fit. I’ll have to get some custom shafts made as well. I presume I will be able to use a larger GT2 pulley than the standard one they are using on the steppers and compensate for it in software.


#5

pi_builder
Please post your results here

madcowswe
Looking in to the spreed sheet, with D5065 270kv motor at distance of 47mm my carriage will be traveling around 3420mm/s. Just making sure I understood it correctly.


#6

I’ll post the results but it may be a while as they haven’t released the printer yet and are only releasing the design files when that happens. I think I may be able to mount the motors the same way they are mounting the steppers (holes slightly wider) and mount the encoder directly onto the frame.