MK2 Surround Nozzle

myminifactory

This design was meant to be a temporary solution before upgrading to MK2.5, as the stock nozzle tab had shattered due to heat warp crash. It shares similarities with the MK3 nozzle design but features an offset half circle due to PINDA clearance. Version 4 48-hour torture test post-mortem: Printing on its side caused vent droop, a strange issue given that center droop is worse despite having more airflow. The overall body showed no droop issues compared to previous versions. Unfortunately, rear cooling was no better than the stock version. Latest Version 4 Highlights: Baffle chamber columns help with printing on its side. No cleaning is required for the nozzle bottom. More unnecessary material has been removed. Mount hole tabs have been flushed more. Reinforcement break-away supports mitigate early crashing. The intake print is messier but acceptable. Unavoidable cleanup has been moved to a less visible side and is much easier to clean. Still requires brim and plate-supports, but significantly less. Original Design directive: An easy swap design for Volcano down the line was the goal. A reinforced right mounting tab for extruder-cover was included. The nozzle skirt area from the extruder-cover part was truncated. Roughly matching the MK3 nozzle design was a priority. Flow was optimized with discreet intake ducting for central air bias, along with surrounding assist airflow based on forum member input. Two 25mm M3 socket screws with washers are required. Other Notes: The "extruder-cover" part, which is directly from Prusa Research and modified, features a truncated version that was left short due to its right side wire guide tab being slightly shorter on my MK2S (latest generation). Since it doesn't impact performance and my MK2S may be unique, it was left as is. The offending weak mount tab has also been reinforced. Additionally, the part was printed solid because Cura has trouble with internal filaments. The nozzle will experience a small amount of heat droop on its first print, so some sanding may be needed to re-flush but seems to settle after a couple prints. Benchy test in ABS: A Benchy photo is shown in ABS at 0.1mm using version 3 without sock. Fan speed was set at 40%, with temperatures at 240°C / 100°C, and print speed at 40mm/s. It was noticed that Matterhacker's standard ABS material was inferior to Prusa Research EasyABS, resulting in pimples and dimples on the printed surface rather than an issue with the printer or nozzle.