I love this model, i am in awe about slider part and its build in support. End cap is okay, but it feels like "eh".
Had few failed and suboptimal parts but at the end i tuned it in:
Spectrum Smart ABS
0.4 nozzle, 0.2mm layers, except handle of slider which was 0.08 (for his pleasure)
Important: precise walls and ironing all top surfaces