# Left extruder "stutters " **URL:** \ **Category:** Sovol SV04 IDEX\ **Created:** [February 25, 2024, 6:20pm UTC](https://forum.sovol3d.com/t/left-extruder-stutters/4598 "2024-02-25T18:20:24Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![Bjoern](https://avatars.discourse-cdn.com/v4/letter/b/46a35a/32.png) [@Bjoern](https://forum.sovol3d.com/u/Bjoern)\ **Post date:** [February 25, 2024, 10:47pm UTC](https://forum.sovol3d.com/t/left-extruder-stutters/4598/4 "2024-02-25T22:47:28Z")
You may want to try some dry run tests without filament in order to make sure that the left extruder stepper motor & motor driver are still in working condition: 1. Heat up left nozzle 2. Remove filament from left extruder 3. Connect SV04 via USB & enter following commands in Printrun/Pronterface console window line by line (alternatively put instructions in several text files & name them sequentially “#.gcode” & run them in sequence). The comments (after “;”) don’t need to be entered: ```auto M83 ; set extrusion to relative T0 ; select left extruder G0 Z20 F800 ; raise extruder M83 ; set extrusion to relative G92 E0 ; reset left extruder G1 F500 E100 ; test left extruder - 4" slowly forward G1 F500 E-100 ; test left extruder - 4" slowly backwards G1 F1500 E100 ; test left extruder - 4" medium speed forward G1 F1500 E-100 ; test left extruder - 4" medium speed backwards G1 F2500 E100 ; test left extruder - 4" fast speed forward G1 F2500 E-100 ; test left extruder - 4" fast speed backwards G1 F3500 E100 ; test left extruder - 4" v fast speed forward G1 F3500 E-100 ; test left extruder - 4" v fast speed backwards G92 E0 ; reset left extruder ``` In case the stuttering occurs repeatably: You could try to change the X- & E-connectors on the [left breakout board](https://github.com/jbu313mlb92ome8w/Sovol_SV04/blob/main/Photos/Breakout_Board.jpeg) located at the left backside of the gantry. Then repeat the tests above, but exchange “E” with “X” ito address the extruder motor. If that test runs successful there is a problem with the left extruder driver. This might be solved by adjusting the motor current on the motherboard trim potentiometer “E1”. If the test still fails you can change the X- & E-connectors back. Most likely the problem is located in the stepper motor or the extruder mechanics. You’ll need to dismantle the extruder & look for mechanical obstructions. Try to [remove the extruder wheel](https://forum.sovol3d.com/t/how-do-i-remove-the-extruder-gear-for-cleaning-or-replacement/4426) and re-run the test sequence again. If the test runs successful try to assemble the extruder & try again. If thetest still fails it is highly likely that your SV04 needs a new extruder. stepper motor. --- _[View the full topic](https://forum.sovol3d.com/t/left-extruder-stutters/4598)._