[Printer] Ender 3 v2 (Mod List)
2021-12-29
Problem: The z-axis stepper and lead screw did not align. The z-axis stepper mounting block was not square on the bottom due to injection molding draft angle. This resulted in the stepper mounting at an angle when screws were tight, and misaligned to the leadscrew.
Fix: The block was squared using the belt sander, then shimmed 1.5mm to locate the motor shaft more directly under the leadscrew.
To account for the remaining misalignment of the z-axis stepper shaft to the lead screw, the rigid coupler was replaced with a spring coupler. A ball bearing was also placed between the motor shaft and the leadscrew. This directly transmits the load from the leadscrew (and weight of the gantry) into the stepper motor shaft while permitting slight misalignment. YouTube: Alex Kenis - ball bearing trick?
Results: https://twitter.com/HackMelbourne/status/1475814344076054533
2021-12-29
Clip holds an extension of the Bowden tube in-line with the extruder filament path. This prevents the filament from coming into the extruder at a sharp angle, therefore resulting in a smoother path with less resistance for the filament.
Link to Mesh and Fusion 360 model
2022-03-05
Brackets to mount the Octoprint server, and camera.
2022-03-15
Problem: When the printer is powered off at the power supply it will draw power from the Raspberry Pi data connection to power the motherboard and screen.
Fix: Custom data cables without the +5V wire were made to eliminate this issue.
2022-03-19
Problem: The Raspberry Pi 3B+ displays an Undervolt detection error. Few power supplies appear to prevent the flag from being triggered during startup. Despite claims, this is not fixed by removing the 5v wire from the OctoPrint data cable. While this error can be disabled, the mod also provides convenience in that the OctoPrint server requires no separate power supply and is turned on and off with the printer.
Fix: A DC-DC LM2596 1.5V - 35V Step Down Adjustable buck converter is used to power the Raspberry Pi from the printer's 24v power supply. The buck converter is set to 5.2v (maximum within the raspberry Pi specification).
