0x00 (NULL) is a collection of various community improvements and designs for the standard Prusa Mendel. 0x00 started as an Open_Hybrid_Mendel printer, but many flaws prevented fast, accurate, and precise printing. In order to keep the cost down, few hardware vitamins were added or replaced. The non-printed improvements were metal GT2 pulleys and belts and metal Z couplings. The ball bearings were replaced by printed LM8UU bushings. The vitamin count was also reduced through using larger prints instead of several smaller ones that would be bolted together.
0x00 is accurate to ~0.1mm in all axes and can print perimeters at 50mm/s and infill at 100mm/s reliably. Prints at double that speed have been done, but the chances of the hot tip snagging on the print are much higher due to curling of infill or overhangs. Improvements in cooling may fix this.
- Reduced cost due to using 5/16in rod and printed LM8UU bushings instead of hardened linear rods and LM8UU linear bearings.
- Easy to acquire and replace printed bushings
- Reduced printed part count
Not using the z-drive rod stabilizers seems to have reduced the z-wobble visible in prints. My idea is that the restriction of the threaded rod caused the whole rod to wobble. With the ends free, the threaded rod can freely wobble instead of forcing the x-ends to wobble with it.
- Switch to a vertical X axis. This will hopefully improve print quality and increase the maximum printable z height.
- Redesign X and Y carriages to use only three points of contact on the rails. This should reduce binding of the carriages.
Five standard NEMA 17 motors.
A Budaschnozzle 2.0 hot tip.
The heater resistor should be removed, wrapped in aluminum foil, and slid back into place to ensure better contact with the heater block. Other methods of ensuring good contact would work, but I have not experimented with any others.