Tevo Tarantula X/Z-axis rework

thingiverse

First Introduction Printer: Tevo Tarantula, Dual Extruder, 2x E3Dv6 Hotend, Integrated Layer Fan Problem: The Printer's Frame Limits X-Travel Solution: New X-Axis with MGN12 Linear Rail Upgrade Keeps the Frame and Size Itself. Dual-Z-Drive is Recommended. Maybe Possible with Only One Lead Screw, Don't Know. Options to Put Motors on Top or Bottom. Need 400mm Linear Rods and LM8UU Bearings, Lead Screw and Threaded Rod from Stock Tarantula Should Work, Same Height So Far. Easiest Way: Steppers at the Bottom, Bracket Takes Stepper and Rod, Corner Bracket Stabilizes Frame and Has Opposite End of Rod, Preventing Movement and Ensuring Everything Is Square. If Want to Have Motors on Top, Need to Put Something Between Bottom End of Rods and Base to Guide Rod and Prevent It from Falling Out. Use Frame Sockets on Left and Right and Small Cylinders as a Guide. Can Use Bottom Motor Bracket Without Motor or Edit CAD Source and Remove Motor Cutouts. One Pro of Solution with Motors on Top is Free Space at the Bottom. Possible That Lead Screw Could Hit Coupler Before Nozzle Touches Bed. Coupler Can Be Moved Down, But Then Less Space to Tighten Scrub Screw Against Threaded Rod. Can Shorten Motor Shaft in Worst Case, Lowering Stepper Is Nearly Impossible. Primary Problem with Stock Y-Axis, Not with MGN12 Guided Bed. X-Axis After Replacing Early Version with Enforced One Facing Directly to Extrusion on Two Sides, X-Axis Is Moving Fine. Pulley on Motor-Side Uses M3x25 Screw. If Longer Available, Use Nut Else; Opposite Hole Designed for Self-Tapped. Idler Side Uses M5x35 Screws and Nuts. Insert 0.75mm Washer Between Pulleys and Thin Walls and Stock 5mm Spacer Plus Washer on Other Side to Center Pulley to Extrusion So Belt Runs Straight. If Go with Z-Axis Motors on Top and Setup in Second Image Below, Challenge Is Fixed Point for Rod at Bottom. Most Rods Length Is 300 or 400 or 500mm. Resulting Distance Needs to Be Negotiated with Pin at Bottom or by Attachment Between Top Z Corner Bracket and Rod. Maybe Use Frame Sockets on Corners. These Two Are Simple to Complete with Other from www.thingiverse.com/thing:1458534 Used Same Bottom Height. Most Easiest Method Is Inverted Z-Axis with Reasonable Expenditure as Made It, Including Bottom Stand for Rod and Minimum of Printed Parts.