Kossel 680mm 20x20 reinforcement

thingiverse

This is a "2 in 1" upgrade for any cheap Kossel/Delta with long vertical extrusions/rods measuring 20x20x680mm. These printers often come with low-quality rods, which cost between $25 to $60 for three good quality replacements, depending on the source. With this upgrade, you get better prints thanks to your printer being enhanced with smoother rods. You also stabilize your printer a lot by reusing the original rods for stability. The spared old rods will reinforce each corner of the printer at an angle of 7°. Prerequisites: * A 680mm tall 20x20 based delta printer * The model using identical plastic corners for the frame, with two of them used for each three-axis stepper (Bottom parts attach between them) * Versions using a single taller attach for the axis steppers require another design for fixation For convenience, I created a Corner set and a Full set. The first one covers one of the three corners, while the second one lets you print everything needed at once. Print Settings: I used 33% infill with full honeycomb in simplify3D, with two shells. PLA works just fine. You can go up to 50% infill if linear. Post-Printing: For each rod, you'll need 1 7Bottom, 1 7Top, and 1 7Feet, along with 6 bolts, 6 washers, and 6 nuts that fit your 20x20 extrusion type (Square nuts or T-nuts). First, get a feel for how easy the printer top can oscillate horizontally. This will help you compare after the upgrade. Instructions to repeat three times for each corner: 1. Print the parts. 2. Add a bolt, a washer, and a nut (only for a few turns) to the extremity that fits the main frame on 7bottom, do the same on 7top. 3. Now do the same to the side holes that will secure the new rod. 4. Attach 7top to the main frame approximately 1 to 2 cm lower than the top angle plastic part. 5. Attach 7bottom to the main frame between the two bottom angle plastic parts. 6. Plug 7feet to the bottom of the new rod. If calibration is okay, the rod should slide through 7bottom and 7top even when the feet are added; if not, add the feet at the end. 7. Slide the new rod through the holes of the two attached parts, ensuring it rests perfectly leveled with the printer itself, then secure it. Now, try again, and tell me if you're happy.