OO Gauge Box Wagons v2 (MWA, MWA-B and IOA) by MrBunsy

Last crawled date: 3 years, 1 month ago

OO Gauge box wagons in three variants, based on three real British wagons.
Incremental improvements over my original box wagons with a new IOA variant in yellow.
These are part of a larger set of 3D printable trains I've been developing. The entire openscad source and scripts to generate all components are available on github. I've deliberately not included the SCAD files here as the entire design is spread across a large number of files.
There are three variants: MWA (green), MWA-B (grey) and IOA (yellow). See below for more details.
Assembly requires up to eight 4mm M2 screws or hot glue. There are square pits in the bottom of the 'top' and top of the 'base' to allow space for hot glue without changing the shape of the finished wagon, alternatively you can use small (4/5mm) m2 screws - but the glue is more reliable. The bogies require a 10mm M3 screw and two M3 washers (one above and one below the bogie, to help with rotation). The bogies provide fixings for a dapol-style coupling, my 3D printed design works well. The brake wheels, cylinders and buffers should slot in with only a little encouragement - if needed you can clear out the hole by first screwing in an m2 screw, but don't clean the hole too much as they rely on friction to stay in. Since the small slot-in components are easy to snap I recommend printing them in something slightly more flexible than PLA, like PETG.
The main body of the wagon is split into two files ("wagon_top" and "wagon_base") to avoid too much warping when printing. Alternatively the entire wagon is avaible as "wagon_wagon". Good base adhesion is required for printing the top of the wagon. Even with good adhesion there is a slight line of warping, but this is mostly not too visible.
The bogie requires scafolding only on the underside of the coupling holder. If you want a more accurate, but harder to print, version of the bogie set BOGIE_EASY_PRINT to false.
MWA
Uses the MWA_wagon_*.stl files. The four-pronged brake wheel (white PETG) slots into the sides of the wagon base. The two brake cylinders (black PETG) slot into the bottom of the wagon base. Print the following:
MWA_wagon_base: Green PLA
MWA_wagon_top: Green PLA
MWA_wagon_bogie (x2): Black PLA
MWA_wagon_brake_cylinder (STL contains two objects): Black PETG
MWA_wagon_buffer (x4): Black PETG
MWA_wagon_brake_wheel (x2): White PETG
MWA-B
Uses the MWA-B_wagon_*.stl files and some MWA_wagon_*.stl files. The three-pronged brake wheels slot into the sides of one of the bogies. This bogie should be attached at the end furthest from the brake cylinder - there is only one brake cylinder on the MWA-B. Otherwise the same as the MWA wagon.
MWA-B_wagon_base: Grey PLA
MWA-B_wagon_top: Grey PLA
MWA-B_wagon_bogie (x1): Black PLA
MWA_wagon_bogie (x1): Black PLA
MWA-B_wagon_brake_cylinder : Black PETG
MWA_wagon_buffer (x4): Black PETG
MWA-B_wagon_brake_wheel (x2): White PETG
IOA
Uses the IOA_wagon_*.stl files and some MWA_wagon_*.stl files. The brake cylinders are part of the base as they're also yellow. Brake wheels slot into the sides of the wagon base, like MWA. The IOA wagon uses the MWA bogies.
IOA_wagon_base: Yellow PLA
IOA_wagon_top: Yellow PLA
MWA_wagon_bogie (x2): Black PLA
MWA_wagon_buffer (x4): Black PETG
MWA_wagon_brake_wheel (x2): White PETG
Couplings
coupling_wide_dapol_inline_hook (x2): Black PETG
coupling_hook_inline (x2): Black PLA
MWA-B and IOA photos by Foulger Railway Photography, MWA photo by Train Photos
Update 9th March: fixed height of couplings.
Update on 25th March: finally fixed coupling position for non-hornby variants properly, also now have a NEM variant.