I have a new Flex3Drive with an ED3 V6 hotend and need to set

3D Printing
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1

I have a new Flex3Drive with an ED3 V6 hotend and need to set up these stepping parameters.
First, what are the setting I need and do they go in the local.cfg of Redeem?

E Axis Microstepping
We recommend that the stepper driver circuit used with Flex3Drive is set to x8
microstepping

E Axis steps per mm
The correct setting for E steps when using the Flex3Drive is 1900 steps per mm

E axis jerk should be set to 0.1mms

E Axis Acceleration
Set this to 50mms if you are running a system that is locked to x16 microstepping otherwise
set this to 100mms if running with x8 microstepping.

E Axis Feed Rate
This is the maximum speed the E axis can run, and whilst normal extrusion speeds are very
low, the biggest impact of this setting is the maximum permissible retact speed that can be
achieved. Set this to 25mms for x16 microstepping and 50mms when using x8
microstepping.

2

http://local.cfg

[Steppers]
steps_pr_mm_e = xxx

3

@Dan_Cook

Dan

Thanks. So in the local.cfg

[Steppers]
steps_pr_mm_e = 1900

So will the 1900 setting work?

How do I set microstepping to x8?

Jerk, accel and speed I have configured.

Bob and Erika

4

My local.cfg
If I push up the steps_pr_mm_e = 120 any higher my stepper motor coughs.

[Homing]
home_x = 0
home_y = 0
home_z = 0

[Steppers]
direction_e = -1
steps_pr_mm_e = 120
current_z = 1.0
current_e = 1.1

[Cold-ends]
connect-therm-e-fan-0 = True

5

@Bob_McDowell ​ I’m not sure about the x8… plug in the 1900 and then calibrate a length of filament with a caliper or ruler.

6

When I use any setting above steps_pr_mm_e = 120 the motor stalls. Even when I use a unattached stepper motor. Tried it on 3 different stepper motors. I tried turning down the current_e to various smaller values, no joy. HELP! By the way, the Flex3Drive is really cool and the support from Jason is supberb.

7

Maybe try to make ‘jerk’ higher.

8

What is your speed for stepper e?