Just keep the wood dust away from the heater.
Also the cold oil could be making this problem worse:
https://forum.onefinitycnc.com/t/the-importance-of-dust-collection-and-maintenance-on-the-onefinity/8996
https://forum.onefinitycnc.com/t/how-to-clean-the-ball-nut-on-the-onefinity-cnc-support/9402
Let us know how it goes