(Note: As marked in the figure, keep the top idler mount and endstop mount below the bottom of the horizontal aluminum extrusion, or the mini-AB might crash into the screw heads or printed parts. If the belt is still loose, pull the endstop holder upward to adjust the belt tension. While holding the belt end, press the printed cover on and lock it with two M3圆 BHCS. Slightly adjust the position of each component so the bed holder is at the middle of the extrusion and the four marked segments of the belt are as parallel to the Z rails as possible.įirst mount the top endstop holder about 2-4mm lower from the top horizontal aluminum extrusion. Route the belt path as shown in the mechanism figure. The two upper components and their nuts can be slid in from the top. There should be preloaded nuts if you followed the V0.1 manual. The calculator can be used for metric and imperial units as long as the use of units are consistent. Mount each component to the frame (don't fully tighten up yet). The calculator below can be used to calculate effort force in block, tackle or pulley construction. Then mount the printed part to the frame with 2 M3x8 screws. Make a loop on one end of the belt and press it into the printed part. (Note: If you don't want to take the frame apart, it can be mounted without these two nuts but it may be less rigid. Preload 2 M3 nuts at the marked slot on page 32 of the manual. Use the stock Z endstop and the two M2 self tapping screws. The 80T_gear_7mm.stl provided is a thinner version of the M4 toothed gear with 7mm of tooth width instead of 9mm to save a little weight and space. You can refer to Nero's video guide for details about assembling Voron M4. Just mind the placement of the F695 bearings. This is very similar to Voron M4 extruder. Note the places that need threaded inserts. The driven belt path with constant belt length is a movable pulley system with the two belt endsįixed at the upper and lower parts of the frame. (c) In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys. (b) The efficiency of a movable pulley is always less than 100. 1 x NEMA14 Stepper Motor (LDO-35STH42-0504AH, others might also work)Īs shown in the following figure, the belt drive on the motor is a 20T:80T system. Give reasons for the following (a) In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.3 x GT2 20T Pulley (6mm wide / 5mm bore).1 x M5 Washer (about 1mm thick, doesn't have to be accurate).Using a NEMA14 stepper motor (no tight restriction in length) provides another path for V0 to V0.1 upgrade by reusing the Z motor.īOM (Some can be obtained from the original setup) Fasteners.The bed doesn't drop when the Z motor is disabled. M4-like driving gear(1:4) with movable pulley on Z bed(1:2), resulting in a 1:8 speed ratio, provides higher torque and step resolution.This is my attempt to combine the timing belt with a movable pulley system. There already are belt-driven mods like theFPVGeek's V0 Z Belt mod and MathematicalPotato's adapted version for V0.1.
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