Fan duct for ZoneStar P802Q with J-Head hotend

thingiverse

I have a Zonestar P802Q, fitted with chinese J-Head hotend. PLA printing problems persisted after hours, consistently jamming. However, ABS prints remained unscathed! I attributed PLA issues to inadequate cooling due to the filled heat sink part with melted PLA. One air duct designed by widddo caught my attention but was intended for the stock hotend. The J-Head's larger heat sink presented a challenge: 25mm diameter and 50mm length, especially the latter which hindered proper cooling since the 40mm fan was mounted flush to the top of the heat sink, leaving the lower 10mm uncooled and hottest part in need of cooling. I utilized widddo's design as a reference for measurements but didn't remix his work. Initially, I printed his part before realizing its limitations. Installation involved removing the cooling and hotend fans. The hotend fan required M3 nuts which were removed and reinstalled into the air duct. The lower nut was tricky to install from inside; an M3 screw was used to hold it in place initially so it would be at the correct position. Next, I removed the teflon tube screw and clipped the hotend heat sink to the air duct. Fan screws were loosened for proper positioning before reinserting the teflon tube screw. Finally, fan screws were tightened and the cooling fan was reinstalled. Printer Settings: Printer Brand: RepRap Printer: Zonestar P802Q (Prusa i3) Rafts: No Supports: No Resolution: 0.2mm Infill: 15% Notes: I printed with black ABS, and the settings shouldn't be too picky.