Spitfire for FDM Printers

Remixed Spitfire model for the FDM printer.
Note: I'm not sure if this model is supposed to represent a Mk.V or a Mk.IX model, but the two look similar.
FYI, the armament loadout is 2x20mm and 4x.303 for the B-wing and most C-winged Merlin Spitfires.
The early-model Seafires are simply the Spitfire Vb with an arrestor hook and narrow landing gear track.
Edit: This is actually a Mk.IX model with two rectangular radiators.
Update: Added Quad 20mm (C-wing) model, even though the Mk.IX variant rarely used this loadout.
Update 18 Oct: Added Mk. IXc (Dual 20mm) and Mk. IIa model.
Update 19 Oct: Added Mk. Ia model.
Update 22 Oct: Renamed Spitfire Mk. 5 files to Mk. IXb/c (Quad 20mm) files
Update 22 Oct, No. 2: Added Correct Mk. Vb, Mk. Vc, and Mk. Vc (Quad 20mm) models.