Here are a few quick troubleshooting steps before contacting support in regards to issues you may be having with Hemera.
1. Check your firmware settings.
- Firmware modification is not an optional step, in order for your Hemera unit to work effectively you must make the outlined firmware modifications. If you are not familiar with which settings you need to change please see: 03 - Hemera Firmware Modifications
2. Check your E-steps
- Whilst we state an E-steps parameter of 409 steps per mm, be advised that this is based on a microstepping value of 1/16, if you are using a different microstepping value your E-steps value will be different.
- In order to get an ideal step per mm value you will need to fine-tune these settings, a 100mm extrusion test is the best method of doing this.
- If you are entering the E step value via Gcode make sure you are following up with an M500 command in order to ensure the new settings are being saved to the EEprom.
- Also make sure before you do the E steps Calibration that you have activated relative mode.
3. Check you have adjusted your VREF/ configured the correct amount of current the motor is being provided.
- The Hemera stepper motor in all likelihood has a different current rating than the previous motor your printer was using. In order for Hemera to operate effectively at the correct torque level.
- The Current rating for Hemera is 1.33A.
- We have a guide on the VREF values for the most common stepper drivers on the market currently that can be found here: 05 - E3D Hemera Current Adjustments (VREF)
4. Check Idler Tension.
- Hemera units are shipped out with minimal idler tension, we recommend having the idler tension set in a manner where the white spring block is flush with the Idler body, for a clearer picture of this please see steps 17&18 of the main assembly guide: 01 - E3D Hemera Core Assembly
5. Check you have a suitable retraction setting.
- We recommend starting with a retraction value of 0.5mm which can be incrementally increased up to 2mm if you experience stinging or blobbing. If you still experience stringing or blobbing at 2mm reduce the printing temperature and start again.
- If stringing and blobbing persists despite the temperature and retraction tweaking then you should look at the filament you are using, in the first instance dry out your filament, and or consider a different brand.
- Do not exceed a retraction length of 2mm, this will cause molten filament to be pulled into the cold section of the heatbreak and will most likely cause jams.
6. Check you have the motor wired correctly.
- Motors and printer boards wiring of the coil pair orders often vary. If your motors are making a buzzing or clicking sounds and not rotating freely it may be that the motor is wired incorrectly. To check to see if your motor is incorrectly wired please follow this guide: Motor cable wiring
If none of these steps have solved your issues contact email@example.com with a picture of your setup and a description of the symptoms you are seeing along with your order number.