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- pballerss commented on 527666229's instructable How to Calibrate the Extruder on Your 3d Printer
- pballerss completed the lesson Class Overview in the class 3D Printing Class
- pballerss completed the lesson Tools + Materials for 3D Printing in the class 3D Printing Class
![Quadcopter HACK! [Design and print your Propeller Guard]](https://www.instructables.com/files/orig/F2K/OO48/HVGXI79M/F2KOO48HVGXI79M.jpg?auto=webp&crop=1.2%3A1&frame=1&width=270)
Thank you so much!