UPDATE: 5th design iteration. The parts for the original bowden fitting were not correct in V4.There are three files now :- printhead and wind shield- Merlin parts- UBIS parts The design comprises a main part which holds the linear bearings and two interchangeable parts for mounting various hotends (Merlin, UBIS).Used with a crossflow fan, so no fan mounts provided, but the little wind shield instead. But it shouldn't be complicated to add some fan mounts.