Hi everyone,
I’m working on troubleshooting and potentially upgrading the stepper motors on my Vertex K8400 (Velleman) 3D printer, and I’m hoping to get some advice from others who’ve tinkered with this printer or similar setups.
Background:
I’ve had the K8400 for a while and it’s mostly stock.
Lately, I’ve noticed occasional skipped steps and inconsistent layer shifts, especially on longer prints.
I suspect the original NEMA 17 stepper motors (or the drivers) might be getting weak or are overheating under certain conditions.
My questions:
Replacement Motors:
Has anyone replaced the stock stepper motors on the K8400 with different NEMA 17s?
If so, which models (torque ratings, current) worked well?
I want to avoid overloading the drivers, so I’m trying to stay within safe limits.
Motor Drivers:
I’m still using the original motor drivers on the Vertex controller board.
Would switching to external or upgraded drivers (e.g., TMC2208 or 2209) help improve performance or reduce heat/noise?
Cooling & Current:
How hot do your stepper motors usually get during prints?
I’m not sure if mine are overheating or if I need to dial down the current settings in firmware.
Other Upgrade Tips?
While I’m at it, are there any other common mechanical or electronics upgrades you’d recommend for improving reliability?
Any experience, tips, or even pictures of your own K8400 mod would be super helpful. I’d love to hear if someone’s successfully upgraded their steppers or fine-tuned them for more accurate and quieter prints.
Thanks in advance!