Interior Step Ramp for Prusa CORE One

This part addresses a very specific inconvenience I had with my Prusa Core ONE. From time to time, I drop purge lines or an aborted first layer below the bed. To clean those out, I usually slide them to the front, only to have them get stuck at the ledge where the front of the printer meets the bottom panel. This model is a simple ramp that bridges this step.

Features

Even a simple model like this comes with a few features worth mentioning.

Locking tabs

The screws holding the front left and right Z-motors are just close enough to be used as indexing features, given the available print area when producing the filler. It's only a loose contact, but during operation, applied forces push the ramp into place anyway.

Print Orientation

This model is printed upside down, so the print bottom surface becomes the sliding plane, while the stepped side of the staggered layers rests against the bottom panel.

Part Clearance

When installed, this part allows approximately 1 mm of side-to-side movement. This is intentional. The only significant risk with this modification is bulging in the middle, which could raise the ramp. However, with the clearance provided, it should still fit between the indexing screw heads—even in a heated chamber.

Additionally Required hardware

None. Thin double-sided tape is an option, but it increases height. Adding a recess for a strip of tape is an idea for a future iteration.

Print Instructions

In theory, this part prints best with a lower layer height than usual. To keep the thin edge of the ramp close to the build plate, 0.10 mm is a good choice. Since the diagonal orientation throws off the default infill angle, set it to 0° to achieve an effective 45° infill pattern.

For material selection, PLA, PETG, and ASA will all work fine. However, PLA may soften if you frequently print ASA, while PETG provides a reliable middle ground between strength and heat resistance.

Because of its size, the part just fits on the Core ONE’s print bed. I optimized the placement in CAD and saved the correct orientation in the provided STL file. Properly aligned, the footprint measures 249.19 × 219.14 mm, and the ramp should be printed upside down to ensure a smooth surface.

Customization

Check the Remix section! There are already adaptations for specialized use-cases e.g. some that are compatible with z-axis dust covers.

If there is no existing variation, find the Fusion 360 source file in the Download section. When exporting, activate Body4 in the root component, this will assure correct STL orientation in the slicer.