Excited about new encoder: What do I need to order?
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Hello. I have the duet3 mini 5+. I am happy to see that Duet released an encoder, I really needed that due to frequent layer shifts from nozzle collisions with my prints.
The docs say I need to buy the expansion 1HCL. I only want to apply closed-loop encoding to my x and y steppers. Do I have to buy 2 of the 1HCL boards then? Can I just buy the 3HC board? It would be cheaper than 2 HCL boards.
Thank you for your time. -
@tylersuard you’d need two 1HCLs. The “CL” indicates closed loop control (encoder feedback).
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@elmoret I would rather not spend $250 buying the encoders and the 1HCL boards. Do you know of any cheaper options? It seems a bit much to me when the original Mini 3 5+ was only $150
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@tylersuard said in Excited about new encoder: What do I need to order?:
I really needed that due to frequent layer shifts from nozzle collisions with my prints.
Best option is to identify what causes the layer shifts:
- Is there a lot of curl-up on your prints? If so then perhaps you can reduce it. Depending on what filament you are printing with this might mean reducing or increasing the amount of print cooling, or shielding the printer from draughts.
- If you are running the drivers in stealthChop mode, don't. In that mode they don't react well to sudden increases in load.
- Typically it's travel moves that collide with curled-up parts of the print. You can reduce travel speed (so that the motor has more power, and the nozzle heat has more time to melt the obstruction), or check "Avoid crossing perimeters" for travel moves in the slicer.
- Are you running the motors at an appropriate current? Higher current will make the motors less likely to skip, at the expense of more noise and heat generation.
Using closed loop motors is worthwhile in large printers that cost a lot and for which a failed print can be very expensive. It's not yet cost-effective in typical desktop printers. We have plans for a closed-loop Nema 17 motor (similar to the Nema 23 one that we demonstrated at recent shows) but unfortunately it's delayed by the combination of Bosch refusing to license their CAN-FD patents other than for a complete implementation of CAN-FD (which RRF doesn't need) and a shortage of low-cost microcontrollers with built-in CAN-FD support.
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@tylersuard it’s really only intended for high-end/large printers, is a premium product, not mainstream.
