Aluminum Pen Arm Backer for EggBot

Precision upgrade for EggBot kits
Not currently available

This add-on for EggBot kits replaces the "old-style" wooden pen arm backer with the newest version, made of CNC milled aluminum. This new version is stiffer, stronger, and more reliable. It is now included as a standard part on all new Basic, Deluxe, Pro, and Ostrich EggBot kits that we ship.

If you need a replacement pen arm backer, or if your EggBot kit came with the old-style wooden pen arm backer, we would recommend this aluminum version for a nice little upgrade.


  • Material: 6061-T6 Aluminum Alloy
  • Finish: Plain
  • Overall size: 1.125 × 0.625 × 0.375 inches, nominal.
  • RoHS compliant: Yes
  • Motor shaft hole diameter: 5 mm nominal (oversized for slip fit).
  • Set screw: 10-32 x 1/4", 18-8 SS, included. (Use 3/32" hex driver)
  • Parallel hole thread: 10-32
  • Shaft to parallel hole distance: 0.625" nominal

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