Robo R2 Adjustable Filament Arm

thingiverse

I have made adjustments to the arm, adding an indicator for pressure and repositioning the 12mm bearing so that it contacts the drive gear in its correct position. An adjustable arm is essential for handling wavy filaments that resist passing through the tube. This design utilizes a commonly available 4x12x4 bearing. The Arm requires one m4-.7x20 (socket head or set screw), one m2.5x10, and one m3-.5x20 socket head screws. The Amazon kit contains all necessary screws, and the bearing has an Amazon link. My Arm gradually twisted over time until the plastic cracked. It's essential to inspect your arm regularly to ensure it remains in good condition, as I experienced feed problems that took some time to resolve. This design eliminates the possibility of the bearing twisting, making it extremely strong. Avoid overtightening the m3-.5x20 screw. I made this mistake and pushed out the stepper assembly screw, requiring a new stepper installation. The arm is intended to float slightly when there's no spring pressure. Turn the 1" 1/4-20 thumbscrew until the plastic insert is flush with the bottom of the arm; all play will disappear. Using the included Cura Profile as a starting point is recommended. It's crucial for support settings and prints slowly for maximum layer adhesion and strength. For $25, you can obtain all necessary parts to print a replacement.