EleksMaker A3 Pro X-Axis Tension Adjuster

thingiverse

X-Axis Tensioner for the EleksMaker A3 Pro ===================================== This X-Axis tension adjuster is a remix of ukflyer's version with Dual-V guide wheels. I had to eliminate some issues and remove additional hardware needs. M3 bolts used in the previous version were not standard length, making them hard to source. After building test prototypes, I determined that M3 bolts offered no benefit over simple alignment pins when joining tensioner arm halves. Modifications ---------------- 1. Replaced M3 bolts with pins to hold tensioner arm halves together. 2. Extended wheel hubs outward slightly due to A3 Pro wheels rubbing against housing. 3. Increased Dual-V wheel hub length and eliminated M3 bolt holes, increasing stability. 4. Resized M5 bolt holes for standard clearance. 5. Resized upper tensioning bolt hole to accept an M6 bolt. 6. Added a printed M6 Bolt and two Adjustment wheels for adjusting wheel tension against the rail. Preparation ------------ Print two X-Axis Tensioner arm assemblies, one M6x1.0x30mm bolt, and two M6x1.0 adjustment wheels. No supports are needed if printing as positioned in STL file. I printed parts with PETG and 50% infill for strength and rigidity. PLA may work fine but may strip threads on M6 bolt easier if over tightened. Use a standard 30mm M6 bolt and 3-4 M6 nuts instead of printed hardware. Installation -------------- Remove Dual-V wheels and bushings, then replace with tensioner arms. Reuse original assembly bolts. No new or additional hardware is required. Push M6 bolt through upper tensioner bolt hole and screw on adjustment wheels before allowing M6 bolt to exit the other side (see images). Adjust tension using wheels until achieving smooth motion while moving carriage. Check that all four wheels touch guide rail and rotate when moving along rail.