Kessel making short stops while extruding:

3D Printing
,
1

Kessel making short stops while extruding: http://youtu.be/-Vr1z16w4fY please help me about

2

thank for your reply, but unfortunately I have to say it happens everytime, every software I use : I tried printing manually from Sd card, and by Pronterface connected on USB, having the same result< and the defect is present while moving from homing to the bed (ex. G1 Z10), I don=t know what and where to find…

3

Are you reaching your segs/sec limits in Marlin? If you have a larger delta, 1/32 microstepping and are running relatively high print speeds like 80mm/sec (and especially if you have a .9 deg stepper too) you may be maxing out the planner. There’s a setting delta segs/sec which is default at 200, you might try setting this lower:

#define DELTA_SEGMENTS_PER_SECOND 160

Each of the controlled steppers contributes to this max, so you could also lower the microsteps for e.g. your extruder and squeak out a little more performance - otherwise you might use repetier firmware which is a bit more efficient, or just move to 32 bit like Smoothie firmware on Smoothie board or Azteeg X5.

4

Are you using RepRapDiscount Full Graphic Smart Controller? Known problem with deltas and ramps.

5

Yes, I have that display, after disabling it no more problems, now the question is : is there a way to keep it working without problem?

6

This happened to me also, I asked a few times on IRC but never got a solution. I ended up switching the XXL smart controller on my prusa i3 with the delta’s full graphic and now it doesn’t miss a beat. I’m guessing it just takes more processing power to use the full graphic display.