User:Elmatador

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Member of the State College RUG


Introduction

I am a student at Penn State working on a Hybrid Prusa Mendel build. Have a prusa of my own on the way as well. It's all built, just need to finish calibrating and fixing small problems.

Projects:

  1. Building a Prusa Mendel PSU Unit Green for Penn State's Reprap class.
  2. Finishing my own personal SAE Prusa build.

My Prusa

Hardware

Electronics

  • Sanguinololu 1.3a
  • Pololu A4988 Stepper Drivers

Firmware

  • Sprinter

Software

Important Measurements

For use with firmware as well as software:

  • Overall
    • Stepper motors are 1.8° per step or 200 steps per revolution
    • Driven by Pololu A4988 drivers with sixteenth-step settings
  • X & Y axes
    • 8 tooth pulley using XL drive belt
      • (steps per motor revolution) ÷ (drive belt teeth per revolution) ÷ (belt pitch OR distance between belt teeth) = steps per millimeter
      • 200 (without microstepping) ÷ 8 (default pulley) ÷ 5.08 mm = 4.921 steps per mm
  • Z axis
    • 5/16"-18 threaded rod
      • (steps per motor revolution) ÷ (pitch of the thread) = steps per millimeter
      • 200 (without microstepping) ÷ (25.4 ÷ 18 or 1.411) = 141.732 steps per mm
  • Extruder
    • 5/16" hobbed bolt
      • (steps per motor revolution) × (gear ratio) ÷ (pinch wheel diameter × π)
      • 200 (without microstepping) × (39 ÷ 11 = 3.545) ÷ (7.08 × π = 22.242) = 31.880 steps per mm
    • 3mm feedstock and a 0.50 mm nozzle


Thanks to McNeight for the measurements and profile setup.

El Matador - Spanish for "The Matador"

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