Category Archives: Prusa i3 Mk3

Prusa Research’s i3 Mk3 printer is their latest offering. It culminates their best efforts to create a balance of cost and performance.

The Prusa i3 Mk3 is a cartesian printer with a full range of sensors. It runs on a Atmega processor. And the i3 Mk3 has an optional MMU 2.0 module for swithing between up to five filaments during prints.

Igus Drylin Bushings: Replacing Bearings on a 3D Printer

My Prusa i3 Mk3 printer’s LM8UU bearings were acting up. It could’ve been an issue with the installation. Or they might’ve just been junk out of the box.

Regardless, it’s time to replace them. With three Igus Drylin bushings in-hand I’ve decided to swap those in on the printer, at least temporarily.

IGUS Drylin install on the Prusa i3 Mk3 3D Printer
Continue reading Igus Drylin Bushings: Replacing Bearings on a 3D Printer

Prusa i3 Mk3 MMU 2.0 Banging on Start

If you haven’t seen it yet Prusa’s i3 Mk3 MMU 2.0 printer module offers up multi-material printing using five pre-loaded filaments with a single extruder. The magic happens with a fairly ingenious filament selector module hanging out above the printer proper.

And it works. The selector is adequate at selecting filaments and I’m not seeing much of an issue with it’s functionality. That’s barring wildly out-of-diameter filament widths (1.9mm+ instead of the spec 1.75mm).

However, there seem to be some teething problems with the software design. One of the issues I’ve come up with on that end is the auto detection and alignment of the MMU 2.0 carriage.

On start the MMU 2.0 seems to be detecting the right end of the carriage too soon. Then it hammers against the left side of the carriage when the MMU 2.0 moves back. It’s using resistance on the stepper motor driver and appears to be very sensitive. 

I’ve posted two videos, the first of it working properly and the second of the failing carriage detection. If you’re curious about the MMU 2.0 or are trying to check if what you’re own printer is doing is normal here you go.