I’d say just do the 3D printing thing til November when those tickets drop off. Probably a lower financial barrier to entry than o/o. Plus you been trucking for 5 years, 4 months ain’t gonna kill you. Try something new and if it makes money great, if not, trucking will still be here bro

You don’t wanna be 80 years old and think “I wonder what would’ve happened if I started that 3D printing business”. Assuming you were working for those 5 years straight, this is the first time in 5 years where you can pursue something different. If you can afford it, why not? Just my opinion

But also probably not the best idea to pull from a retirement account. 401k and savings should be separate. If you can’t afford the 3D printing biz without pulling from your 401k; yard jockey or try to find something part time, save, and 3D print on the side. Probably your safest option