Test VFA tốc độ cao cho Core One (40–350 mm/s)

VFA (Vertical Fine Artifacts) test models for a wide range of Prusa Core One printing speeds from 40 to 350 mm/s.

There are notches 5 mm apart at the edge of the models, marking speed changes in 10 mm/s increments.

To observe VFAs, you need to use shiny filament and achieve glossy prints.

Make sure silent mode is turned off, as it limits printing speed.

G-codes and PrusaSlicer projects are prepared for PLA using a 0.4 mm high-flow nozzle. The first layer is printed at 230°C, while the rest of the layers are adjusted to:

• 40 - 90 mm/s at 230°C
• 100 - 150 mm/s at 240°C
• 160 - 200 mm/s at 250°C
• 210 - 250 mm/s at 260°C
• 260 - 300 mm/s at 270°C
• 310 - 350 mm/s at 280°C

High printing speeds (high volumetric flow rates) usually require a higher nozzle temperature, as the melted plastic absorbs heat and acts as a nozzle cooler. Properly melted shiny PLA should remain shiny after printing. If your prints are not coming out glossy, you have two options:

1. Increase the temperature after the first layer is printed. Each material brand behaves differently at high volumetric flow rates, so there is no universal temperature setting.
2. Lower the layer height. It's prepared with 0.2 mm layers. Smaller layers result in a lower volumetric flow rate.

Some printers hide VFAs by using low printing temperatures, which result in matte surfaces. However, be aware that matte prints from shiny filaments often indicate weak layer bonding and fragile prints.

VFAs may appear only at specific speeds, print angles, and directions. Unlike similar models, these are designed for optimal visual inspection of prints. They are also large enough to accommodate high speeds, minimizing the impact of acceleration and deceleration zones.

How it's made

Changes in printing speeds are prepared in PrusaSlicer with inserted M220 G-code at specific layers that adjust the feedrate. For example, in the 40-90 mm/s file, the feedrate is set to 40%, 50%, 60%, and so on, of the 100 mm/s external perimeter speed. Files for speeds above 200 mm/s are based on a 200 mm/s external perimeter speed.

I was inspired by other tests for slow printing speeds, but I created everything from scratch.