Prusa MK3 goodness

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Re: Prusa MK3 goodness

Post by MartyS » 2018-Apr-Tue-13-Apr

We got an MK3 pre-built at work last week, I can't get over how quiet it is, and the quality of the prints is amazing.

Seriously thinking about getting one for home.

Re: Prusa MK3 goodness

Post by cbxbiker61 » 2018-Apr-Mon-17-Apr

The MK3's are hackable like pretty much all of the RepRap style printers. The problem with hacking it is that the components and design are at a level where there is very little need to change it. The cheap 3d printers have a lot of low-hanging upgrade fruit because they'start with piss-poor design and quality (with a few exceptions).

I'm sure your going to love the MK3! Prusa is redoing the multi-material upgrade for the MK3, so you'll end up with a second gen multi-material upgrade that should be more refined than the original.

Re: Prusa MK3 goodness

Post by RetireeJay » 2018-Apr-Mon-16-Apr

I recently finished building a Prusa Mk3 from kit. The experience was better than I expected. The metal parts are very solid and robust. The printed parts - and there are many - have amazing quality. There were only a very few places where I had to adapt or modify to get the assembly to work.

The build instructions are absolutely stellar! They provided very clear step-by-step procedures with pictures. Sometimes the pictures in the printed book (yes, there was a printed book!) were a little hard to interpret due to poor contrast of black-on-black, but the parallel online book cleared up all those questions.

The machine worked perfectly on the first try (it helps that I had experience with things like belt tension). You can print either from the SD card (a full size card) or via USB from your computer (the USB connector is the original, robust squarish design, not a small fragile micro-connector).

Repetier does work with it, although I found that I had to set the baud rate to 115200. Probably Cura works also. Prusa has a download package with several programs. One is a simplified wrapper for Slic3r Prusa Edition, but it looks like it is oriented to creating Gcode files for the SD card, not controlling the machine. The package also includes Pronterface - but this UI screen doesn't show you the actual X, Y, Z coordinates or the actual temperatures. They did make a change to the coding of the reported bed temperature from the printer, so Repetier doesn't display or graph the bed temperature even though it can control it.

From the 30,000 foot view, the MK3 is a more solid and well-engineered printer than the old plywood Printrbot Plus. On the other hand, it will be much more difficult to modify with homebrew changes; "it is what it is". It's faster, much quieter, and more precise.

The extruder assembly is a marvel of compactness: direct-drive gear, an extruder body fan, a print-cooling fan, a bed probe, and a filament sensor, all in an assembly smaller than the Printrbot extruder. Both fans are 3-wire with speed sensing; the bed probe is a miniature version with included temperature sensor for compensation, and the filament sensor has four wires - so the grand total wire count going from the extruder body to the Einsy board is pretty high indeed!

I'm looking forward to eventually installing the Prusa multi-material upgrade, especially so that I can do prints with dissolvable supports.

In a few days, the Prusa is going to move onto the favored position right next to my computer and the old Plus is going... where??? I have no idea yet.

Prusa MK3 goodness

Post by cbxbiker61 » 2017-Sep-Sun-00-Sep

Prusa does it again....

The MK3 is a marvel. Every feature I can imagine wanting is in the MK3.

BTW, there is going to the a MK2.5 upgrade kit for those of us with MK2's, which will get us some of the goodness of the MK3.

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